chess-puzzles, branch HEAD

pedantic fix: "is in check" for illegal king position

2026-01-09T17:40:40Z

commit f6061bfecd18263a16740fc9e7d5963256067acc parent aef0f99f15006e8c8866938af32cebb8bb8ea7bf Author: Hiltjo Posthuma Date: Fri, 9 Jan 2026 18:40:40 +0100 pedantic fix: "is in check" for illegal king position Check the first king that is in check depending on who's side it is to play. This tests for an illegal king position which is of course illegal. Test with only white kings used to be in check/highlighted (fixed now): ./fen -o tty '8/1KK2KK1/1KK2KK1/8/3PP3/P6P/1P4P1/2PPPP2 w - - 0 1' ./fen -o tty '8/1Kk2KK1/1KK2KK1/8/3PP3/P6P/1P4P1/2PPPP2 w - - 0 1' ./fen -o tty '8/1Kk2KK1/1KK2KK1/8/3PP3/P6P/1P4P1/2PPPP2 b - - 0 1'

fen.c: add "print" theme, suitable for black and white printers

2025-07-24T11:09:43Z

commit aef0f99f15006e8c8866938af32cebb8bb8ea7bf parent e2267c734e12d3cccd80d6314d9d21bb31584bc5 Author: Hiltjo Posthuma Date: Thu, 24 Jul 2025 13:09:43 +0200 fen.c: add "print" theme, suitable for black and white printers ... or ereaders, etc.

bump LICENSE year

2025-07-22T14:00:03Z

commit e2267c734e12d3cccd80d6314d9d21bb31584bc5 parent a3b62d1145d314c0743fead2285f33326afeb263 Author: Hiltjo Posthuma Date: Tue, 22 Jul 2025 16:00:03 +0200 bump LICENSE year

fen.c: for tty output show the indicator on the side to move, just like SVG

2025-07-22T13:58:43Z

commit a3b62d1145d314c0743fead2285f33326afeb263 parent 340135cbaf1e942bafaa617b805aef4090601555 Author: Hiltjo Posthuma Date: Tue, 22 Jul 2025 15:58:43 +0200 fen.c: for tty output show the indicator on the side to move, just like SVG

fen.c: tiny cleanup, rm 1 line

2025-07-22T13:27:47Z

commit 340135cbaf1e942bafaa617b805aef4090601555 parent 207a970e589950d41fe4512c6687131f5ed60e82 Author: Hiltjo Posthuma Date: Tue, 22 Jul 2025 15:27:47 +0200 fen.c: tiny cleanup, rm 1 line

fen.c: add option to show side indicator to CGI mode too

2025-07-22T13:25:00Z

commit 207a970e589950d41fe4512c6687131f5ed60e82 parent fea5413be3348ec3c167a10fcc0820a50d0d070e Author: Hiltjo Posthuma Date: Tue, 22 Jul 2025 15:25:00 +0200 fen.c: add option to show side indicator to CGI mode too

fen.c: add an -s and -S option to show a move indicator on the board

2025-07-22T13:19:49Z

commit fea5413be3348ec3c167a10fcc0820a50d0d070e parent c7fb7a700cbaa565d988cfb7e49f25c85159648f Author: Hiltjo Posthuma Date: Tue, 22 Jul 2025 15:19:49 +0200 fen.c: add an -s and -S option to show a move indicator on the board ... also a fix: add -h and -H to usage, it was missing.

cleanup: ModeCGI is unused

2025-07-22T13:14:03Z

commit c7fb7a700cbaa565d988cfb7e49f25c85159648f parent aba286b23210523ed76e012d608c3e09c65e9dad Author: Hiltjo Posthuma Date: Tue, 22 Jul 2025 15:14:03 +0200 cleanup: ModeCGI is unused

improve some comments

2025-03-09T09:47:03Z

commit aba286b23210523ed76e012d608c3e09c65e9dad parent d30b443f23a15ffab12f6a00931d979b9cfab061 Author: Hiltjo Posthuma Date: Sun, 9 Mar 2025 10:47:03 +0100 improve some comments

do not use ctype functions

2025-03-09T09:46:12Z

commit d30b443f23a15ffab12f6a00931d979b9cfab061 parent 07c37ef3931e33b55aebe2561ed92d37735cabe8 Author: Hiltjo Posthuma Date: Sun, 9 Mar 2025 10:46:12 +0100 do not use ctype functions These can be locale-specific on some platforms.

tests.sh: add a few more tests for ambigous moves (files and ranks)

2024-06-11T22:28:12Z

commit 07c37ef3931e33b55aebe2561ed92d37735cabe8 parent 887918beab1aba026f2c228bb8ef770d420d338e Author: Hiltjo Posthuma Date: Wed, 12 Jun 2024 00:28:12 +0200 tests.sh: add a few more tests for ambigous moves (files and ranks)

fix notating files and rank for piece moves

2024-06-11T13:42:26Z

commit 887918beab1aba026f2c228bb8ef770d420d338e parent 32c2e6a2c44fba3b0242123894dcacf79f59578f Author: Hiltjo Posthuma Date: Tue, 11 Jun 2024 15:42:26 +0200 fix notating files and rank for piece moves Do not notate files and ranks for pawn moves (requires only file). Do not allow to output the same file twice.

fix incorrect check of enpassant square (x -> y) for checks/checkmate

2024-06-11T13:41:46Z

commit 32c2e6a2c44fba3b0242123894dcacf79f59578f parent 13632b938c00ed21681a7bde25d8c119666524b8 Author: Hiltjo Posthuma Date: Tue, 11 Jun 2024 15:41:46 +0200 fix incorrect check of enpassant square (x -> y) for checks/checkmate

add 2 tests and log errors to stderr

2024-06-11T13:41:20Z

commit 13632b938c00ed21681a7bde25d8c119666524b8 parent b157d49005e4d9fd2e5e979b72a1e222e21fdec3 Author: Hiltjo Posthuma Date: Tue, 11 Jun 2024 15:41:20 +0200 add 2 tests and log errors to stderr

add option to not highlight the last played move or checks or checkmates

2024-02-29T18:02:30Z

commit b157d49005e4d9fd2e5e979b72a1e222e21fdec3 parent 52d9636da4a82de476f21b1c61de8b7570f96c92 Author: Hiltjo Posthuma Date: Thu, 29 Feb 2024 19:02:30 +0100 add option to not highlight the last played move or checks or checkmates This is better for puzzles/training. Sometimes the last played move gives a hint of a blunder etc. This adds an extra challenge to analyze more properties of the position.

add love theme and valentine puzzles

2024-01-31T20:09:22Z

commit 52d9636da4a82de476f21b1c61de8b7570f96c92 parent 208dbcea3dd150fb2eb4ef1a8469acf9df2940ab Author: Hiltjo Posthuma Date: Wed, 31 Jan 2024 21:09:22 +0100 add love theme and valentine puzzles

remove TODO

2024-01-28T12:24:42Z

commit 208dbcea3dd150fb2eb4ef1a8469acf9df2940ab parent 8f1c842cc8cc6ef6a5b8f6020a94d54a83f21542 Author: Hiltjo Posthuma Date: Sun, 28 Jan 2024 13:24:42 +0100 remove TODO

tests.sh: remove duplicate tested entries

2024-01-28T12:23:20Z

commit 8f1c842cc8cc6ef6a5b8f6020a94d54a83f21542 parent 4edab675e79782ae15324c3a890c87068521b999 Author: Hiltjo Posthuma Date: Sun, 28 Jan 2024 13:23:20 +0100 tests.sh: remove duplicate tested entries

test all possible castling positions

2024-01-27T20:02:21Z

commit 4edab675e79782ae15324c3a890c87068521b999 parent 551d1075b050556fafd5ff8c86e0b3a92bbbda46 Author: Hiltjo Posthuma Date: Sat, 27 Jan 2024 21:02:21 +0100 test all possible castling positions Castling is perfect now, except for illegal UCI moves.

fen.c: fix castling for chess960

2024-01-27T20:00:45Z

commit 551d1075b050556fafd5ff8c86e0b3a92bbbda46 parent bf941d069fdc94c7157de62e737e9f305a751b5b Author: Hiltjo Posthuma Date: Sat, 27 Jan 2024 21:00:45 +0100 fen.c: fix castling for chess960

initial stub for new castling tests

2024-01-27T19:22:18Z

commit bf941d069fdc94c7157de62e737e9f305a751b5b parent 78e1ed61ec461637e664b9527f002e232f30ca6e Author: Hiltjo Posthuma Date: Sat, 27 Jan 2024 20:22:18 +0100 initial stub for new castling tests

some improvements

2024-01-22T19:28:16Z

commit 78e1ed61ec461637e664b9527f002e232f30ca6e parent e62dd220612aaada2231586e9c00845700bf4949 Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 20:28:16 +0100 some improvements - be less strict about parsing UCI moves, just space-separated - add script to quickly convert PGN to gif, using pgn-extract. - improve some comments. - move scripts to root dir.

tests.sh: add a few more castle tests

2024-01-22T18:56:19Z

commit e62dd220612aaada2231586e9c00845700bf4949 parent bcb9d6c7bd496cd907cd960f599eb8d19730973d Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 19:56:19 +0100 tests.sh: add a few more castle tests update TODO

docs: archive table with chess960 starting positions

2024-01-22T18:42:53Z

commit bcb9d6c7bd496cd907cd960f599eb8d19730973d parent 3ee1d913ba6bcafbf4647c86d45aaf958954793e Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 19:42:53 +0100 docs: archive table with chess960 starting positions

add a separate script to generate a gif or tty animation from FEN + moves

2024-01-22T18:28:32Z

commit 3ee1d913ba6bcafbf4647c86d45aaf958954793e parent 5bf484cc8a074778fe73a54541288119dd207822 Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 19:28:32 +0100 add a separate script to generate a gif or tty animation from FEN + moves

fen.c: improve more subtle things in chess960 castling

2024-01-22T00:36:43Z

commit 5bf484cc8a074778fe73a54541288119dd207822 parent 34e46a6fdd7cddde422a6b75c285879951d540e9 Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 01:36:43 +0100 fen.c: improve more subtle things in chess960 castling

generate.sh: fix to detect possible rook promotion and support uppercase

2024-01-22T00:09:24Z

commit 34e46a6fdd7cddde422a6b75c285879951d540e9 parent 0dcd2f065cb678018fb2e30055550987705a09c5 Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 01:09:24 +0100 generate.sh: fix to detect possible rook promotion and support uppercase

tests.sh: add some more castling and chess960 PGN tests

2024-01-22T00:07:15Z

commit 0dcd2f065cb678018fb2e30055550987705a09c5 parent 14096028aee533f132200b020687e1ce3884105b Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 01:07:15 +0100 tests.sh: add some more castling and chess960 PGN tests

fen.c: simplify castling code

2024-01-22T00:04:59Z

commit 14096028aee533f132200b020687e1ce3884105b parent 3ccf4d4450965cc2853d9cbc8b81b75cfd44660a Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 01:04:59 +0100 fen.c: simplify castling code

fen.c: fix highlight square when castling

2024-01-21T23:55:15Z

commit 3ccf4d4450965cc2853d9cbc8b81b75cfd44660a parent 7915ffd10d87934201c751632a4e1dd4c3cb65cb Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 00:55:15 +0100 fen.c: fix highlight square when castling

fen.c: improve castling with chess960

2024-01-21T23:55:02Z

commit 7915ffd10d87934201c751632a4e1dd4c3cb65cb parent 37c4fe7bb023a2537fd8221042a9b62086c6532b Author: Hiltjo Posthuma Date: Mon, 22 Jan 2024 00:55:02 +0100 fen.c: improve castling with chess960

fen.c: fix a typo

2024-01-14T19:30:56Z

commit 37c4fe7bb023a2537fd8221042a9b62086c6532b parent 62500fd8c67b353a43bad026d0f730eccbd90b47 Author: Hiltjo Posthuma Date: Sun, 14 Jan 2024 20:30:56 +0100 fen.c: fix a typo

improve documentation and reference the pgn-extract tool

2024-01-14T18:23:25Z

commit 62500fd8c67b353a43bad026d0f730eccbd90b47 parent e34a8cc5befa1d22f9468bb9169113acb84ef6f8 Author: Hiltjo Posthuma Date: Sun, 14 Jan 2024 19:23:25 +0100 improve documentation and reference the pgn-extract tool

test.sh: add more promotion tests and fixup for case if input is incorrect

2024-01-14T18:17:10Z

commit e34a8cc5befa1d22f9468bb9169113acb84ef6f8 parent a7b46089306de698b20b0400a8ec9f3ccda3f729 Author: Hiltjo Posthuma Date: Sun, 14 Jan 2024 19:17:10 +0100 test.sh: add more promotion tests and fixup for case if input is incorrect

fen.c: fix promotion to rook, fix regression in promotion and PGN output for it

2024-01-14T18:09:38Z

commit a7b46089306de698b20b0400a8ec9f3ccda3f729 parent c569951f00bbd5517962401c1f090cac6a99a8c5 Author: Hiltjo Posthuma Date: Sun, 14 Jan 2024 19:09:38 +0100 fen.c: fix promotion to rook, fix regression in promotion and PGN output for it

update TODO

2024-01-08T21:01:09Z

commit c569951f00bbd5517962401c1f090cac6a99a8c5 parent 79add5ed63f4c15703b14bfa3209d5046f8ebb3f Author: Hiltjo Posthuma Date: Mon, 8 Jan 2024 22:01:09 +0100 update TODO

fen.c: remove unneccesary check

2024-01-08T20:55:31Z

commit 79add5ed63f4c15703b14bfa3209d5046f8ebb3f parent abc52654a913253417dcd329cf70a975f8674dd6 Author: Hiltjo Posthuma Date: Mon, 8 Jan 2024 21:55:31 +0100 fen.c: remove unneccesary check

fen.c: fix invalid piece name for queenside castling for black

2024-01-08T20:54:24Z

commit abc52654a913253417dcd329cf70a975f8674dd6 parent df3a95f12df8a701ed0ad5997be6ad5c3f840bda Author: Hiltjo Posthuma Date: Mon, 8 Jan 2024 21:54:24 +0100 fen.c: fix invalid piece name for queenside castling for black This probably affects queenside castling for black with Chess960 and certain combinations (rook very close next to king). (Writing more Chess960 and castling tests is on my TODO already.)

small code-cleanup and add some comments

2024-01-08T20:50:26Z

commit df3a95f12df8a701ed0ad5997be6ad5c3f840bda parent da65c61271ad6e8eb3fde5a8e828ed4d2c882fb2 Author: Hiltjo Posthuma Date: Mon, 8 Jan 2024 21:50:26 +0100 small code-cleanup and add some comments

fen.c: CGI mode: write output header before play moves

2024-01-08T20:36:42Z

commit da65c61271ad6e8eb3fde5a8e828ed4d2c882fb2 parent 2037128c8c5a1527bddad29041660177a1cee999 Author: Hiltjo Posthuma Date: Mon, 8 Jan 2024 21:36:42 +0100 fen.c: CGI mode: write output header before play moves ... else PGN output will be before the header is written.

fen.c: CGI mode, add dutch mode parameter, will also set piece mapping

2024-01-08T20:36:15Z

commit 2037128c8c5a1527bddad29041660177a1cee999 parent 5f6b743ef448f1d096d01ffafe4d112e47768a2f Author: Hiltjo Posthuma Date: Mon, 8 Jan 2024 21:36:15 +0100 fen.c: CGI mode, add dutch mode parameter, will also set piece mapping

tests.sh: add 2 tests

2024-01-07T14:51:17Z

commit 5f6b743ef448f1d096d01ffafe4d112e47768a2f parent 1f750e11a33213399d0ae7f8817d52f35cc8b6b8 Author: Hiltjo Posthuma Date: Sun, 7 Jan 2024 15:51:17 +0100 tests.sh: add 2 tests

various improvements and features

2024-01-06T14:40:35Z

commit 1f750e11a33213399d0ae7f8817d52f35cc8b6b8 parent 0fe1f6ac19819dd3954b8520db31a66f76d7cf87 Author: Hiltjo Posthuma Date: Sat, 6 Jan 2024 15:40:35 +0100 various improvements and features ... do all the things and do them meh. - ambigous moves improvements and fixes. - add "speak" mode, describe a move in human-like language (dutch and english). - add -l option to only output the PGN or description of the last move, useful for speech engines. - FEN output: reset en passant square on checkmate (like Lichess does). - lichess stream script: add description of the move and use espeak to say it. - add a page of the puzzles intended for the tty (index.vt). - index.html improvements: - CSS tweaks to better align 2 puzzles in the center. - hyperlink color. - add simple plain-text listing in solutions.txt file. - add title and alt of the solutions moves in PGN and as a description. - tests: - add more of them. - return exitcode 0 or 1 on a failure. - prefix type of test: PGN or FEN.

update TODO and failing tests

2024-01-04T20:03:31Z

commit 0fe1f6ac19819dd3954b8520db31a66f76d7cf87 parent 6554fcb56e12be089dbbf0e700f6777924e8b5b6 Author: Hiltjo Posthuma Date: Thu, 4 Jan 2024 21:03:31 +0100 update TODO and failing tests This is an edge-case to defend en passant. Fix it later. 2 tests are succeeding, but this is because it is not implemented.

enable output options for the CGI mode

2024-01-04T16:04:22Z

commit 6554fcb56e12be089dbbf0e700f6777924e8b5b6 parent cd3acc17b7b82e112bd5abbc65324283a7c5bf7f Author: Hiltjo Posthuma Date: Thu, 4 Jan 2024 17:04:22 +0100 enable output options for the CGI mode

various improvements

2024-01-04T15:44:29Z

commit cd3acc17b7b82e112bd5abbc65324283a7c5bf7f parent f1daa80c1d6cf199c57d820e117255f38bd3d55e Author: Hiltjo Posthuma Date: Thu, 4 Jan 2024 16:44:29 +0100 various improvements Some are: * Colour themes. * Initial PGN output. * PGN piece localization. * generate.sh: dutch localization. * Highlight check or checkmate in red. * Add a struct board and localize states. * Add a CGI mode. * Lichess example script, show more information about the players. * Add dark mode CSS. * Add a script to generate animated gifs for solutions. * Documentation improvements. * Many bugfixes.

add LEN() macro and use it

2023-12-25T17:54:16Z

commit f1daa80c1d6cf199c57d820e117255f38bd3d55e parent 6af435b4416d90cb27e447e2f0bf505721374e12 Author: Hiltjo Posthuma Date: Mon, 25 Dec 2023 18:54:16 +0100 add LEN() macro and use it

add util functions for (x,y) to (file, rank) and vice versa

2023-12-25T17:49:58Z

commit 6af435b4416d90cb27e447e2f0bf505721374e12 parent b7a52ecde26555a060898faaa5643851368c7467 Author: Hiltjo Posthuma Date: Mon, 25 Dec 2023 18:49:58 +0100 add util functions for (x,y) to (file, rank) and vice versa

fen.1: comment pgn option for now, it is disabled

2023-12-24T10:51:14Z

commit b7a52ecde26555a060898faaa5643851368c7467 parent 9a70ccee5e9c5462e079304c3521c2c7640bf51d Author: Hiltjo Posthuma Date: Sun, 24 Dec 2023 11:51:14 +0100 fen.1: comment pgn option for now, it is disabled

fen.c: reduce filesize of SVG further

2023-12-24T10:38:26Z

commit 9a70ccee5e9c5462e079304c3521c2c7640bf51d parent e536a441d52c33adea06f8ed451bd890a3ebdb9d Author: Hiltjo Posthuma Date: Sun, 24 Dec 2023 11:38:26 +0100 fen.c: reduce filesize of SVG further Only define drawing commands for the pieces used. Reuse them for multiple pieces. The pawn definition is reused, but with a different fill color.

fen: various code improvements, initial code for PGN output (disabled for now)

2023-12-23T17:59:46Z

commit e536a441d52c33adea06f8ed451bd890a3ebdb9d parent 4f6db6f748b3760f1f991e46bbb37246d201d4c8 Author: Hiltjo Posthuma Date: Sat, 23 Dec 2023 18:59:46 +0100 fen: various code improvements, initial code for PGN output (disabled for now) - Reduce SVG output size by reusing the draw paths for pawns (saves ~4KB per image on average). Of course this depends. On a board with no pawns it can be ~300 bytes larger. - Remove Board FEN header for tty and ASCII outputs. - Make the highlight function more generic (for one move). - Improve outputs parsing, an invalid option now shows the usage(). - Rename the output functions to output_(). - Add initial code for PGN output, needs some work, disabled for now. ... work in progress

stream_lichess.sh: read initial FEN for chess960, show white vs black name

2023-12-21T21:45:17Z

commit 4f6db6f748b3760f1f991e46bbb37246d201d4c8 parent aa7a4692fb14c40930fde876585a70a88b76b3e2 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 22:45:17 +0100 stream_lichess.sh: read initial FEN for chess960, show white vs black name

improve tests and label them

2023-12-21T21:20:34Z

commit aa7a4692fb14c40930fde876585a70a88b76b3e2 parent 35cfce88175a31ca9b1db67e70575f66182d8ab2 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 22:20:34 +0100 improve tests and label them

fen.c: improve castling for chess960

2023-12-21T21:19:16Z

commit 35cfce88175a31ca9b1db67e70575f66182d8ab2 parent cb828aa3fa341d3af5e9338132497cf49671369f Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 22:19:16 +0100 fen.c: improve castling for chess960 In chess960 you can castle right next to the king also. This is handled in the code by "taking a piece", although this is of course your own piece. Note that this doesn't reset the halfmove counter.

generate.sh: only show cursor when solutions are collapsed

2023-12-21T19:29:26Z

commit cb828aa3fa341d3af5e9338132497cf49671369f parent 10ce46bdd74256d98eec084142787f40730c582d Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 20:29:26 +0100 generate.sh: only show cursor when solutions are collapsed ... not on all the puzzle solutions contained within.

generate.sh: fix last puzzles, some usability improvements

2023-12-21T19:27:17Z

commit 10ce46bdd74256d98eec084142787f40730c582d parent 2046625e2948b915fb5f7b6244e54f79cf2c2a8a Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 20:27:17 +0100 generate.sh: fix last puzzles, some usability improvements

fen.c: optimization for size: do not use true-color where its not needed

2023-12-21T18:57:04Z

commit 2046625e2948b915fb5f7b6244e54f79cf2c2a8a parent 2f8f9b16e1834cdd577d590efc51be17f3013585 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 19:57:04 +0100 fen.c: optimization for size: do not use true-color where its not needed - Reduces file size. - Simplify creating a checkered pattern.

fen.c: code cleanup: separate parsing FEN and moves in 2 functions

2023-12-21T17:27:41Z

commit 2f8f9b16e1834cdd577d590efc51be17f3013585 parent 752c96801f72527cf5bc3faab7ad7d1d7889ddbf Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 18:27:41 +0100 fen.c: code cleanup: separate parsing FEN and moves in 2 functions

update TODO

2023-12-21T17:17:34Z

commit 752c96801f72527cf5bc3faab7ad7d1d7889ddbf parent 4d582297eea29262d3ed81b786c28276e006589f Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 18:17:34 +0100 update TODO

improve man page documentation

2023-12-21T17:15:09Z

commit 4d582297eea29262d3ed81b786c28276e006589f parent 667fa14261d797a2c04938992a4efa5061e558a2 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 18:15:09 +0100 improve man page documentation

generate.sh: improve portability and performance, use randomness using a seed

2023-12-21T17:14:27Z

commit 667fa14261d797a2c04938992a4efa5061e558a2 parent b9e10f90912e4d6c82e4a4738a2fcdbd77b0d6db Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 18:14:27 +0100 generate.sh: improve portability and performance, use randomness using a seed - Replace shuf with a custom shuffling using awk and sort -R. - Use a random seed to generate random, but in a deterministic way. Allows regenerating the same output (atleast on the same machine). - Generating the puzzles is faster, tested on a machine: 10s to 3.5s - Show an error message when the CSV database file doesn't exist yet.

improve check for castling and castling availability

2023-12-21T16:58:13Z

commit b9e10f90912e4d6c82e4a4738a2fcdbd77b0d6db parent 526df2437b7f656c5f7f68f207478dd2ee15db53 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 17:58:13 +0100 improve check for castling and castling availability This improves compatibility with chess960.

tty output: remove some unneeded/double escape codes

2023-12-20T23:56:37Z

commit 526df2437b7f656c5f7f68f207478dd2ee15db53 parent 7ec50aca8a290c15c92a71fde6dc99977330ea10 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:56:37 +0100 tty output: remove some unneeded/double escape codes

update README

2023-12-20T23:48:01Z

commit 7ec50aca8a290c15c92a71fde6dc99977330ea10 parent 1a4ecae770df28922372ddc0a2e60cc173237a68 Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:48:01 +0100 update README

fen.1: fix a typo

2023-12-20T23:38:18Z

commit 1a4ecae770df28922372ddc0a2e60cc173237a68 parent 377132fbd774962230e6980b376de721f2ec467e Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:38:18 +0100 fen.1: fix a typo

update TODO

2023-12-20T23:33:07Z

commit 377132fbd774962230e6980b376de721f2ec467e parent 0d2f03825dce77e698f85d349ff7d35e72031f6d Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:33:07 +0100 update TODO

improve tty board border size a bit

2023-12-20T23:32:41Z

commit 0d2f03825dce77e698f85d349ff7d35e72031f6d parent d3c8592f3761018e4fac3ba37503f432cb1dda1f Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:32:41 +0100 improve tty board border size a bit

add a script to stream a lichess game using the FEN tty output

2023-12-20T23:24:03Z

commit d3c8592f3761018e4fac3ba37503f432cb1dda1f parent 528629a967639e013c56fee9c293b7b87376d15e Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:24:03 +0100 add a script to stream a lichess game using the FEN tty output

fen.1: add initial man page

2023-12-20T23:20:34Z

commit 528629a967639e013c56fee9c293b7b87376d15e parent 212c82b75fc13feab19a991ac284ab92e3c352ff Author: Hiltjo Posthuma Date: Thu, 21 Dec 2023 00:20:34 +0100 fen.1: add initial man page

en passant should reset halfmove counter

2023-12-20T22:55:54Z

commit 212c82b75fc13feab19a991ac284ab92e3c352ff parent 10e231516543327f556abc8b73c31c1e114ede48 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 23:55:54 +0100 en passant should reset halfmove counter Add this test separately, just in case.

fix a bug in FEN en passant parsing, handle en passant takes

2023-12-20T22:53:58Z

commit 10e231516543327f556abc8b73c31c1e114ede48 parent f2415a87c11df764bacefa67d70efd1c57bd66ff Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 23:53:58 +0100 fix a bug in FEN en passant parsing, handle en passant takes Add a few tests for them.

update README

2023-12-20T21:46:22Z

commit f2415a87c11df764bacefa67d70efd1c57bd66ff parent d9c1c31debf454d25aaebc6eb90a2bca3e1eb52e Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 22:46:22 +0100 update README

fix typo and compile error

2023-12-20T21:39:53Z

commit d9c1c31debf454d25aaebc6eb90a2bca3e1eb52e parent e1243f806a094c73adcc8bb2dd8633ff852ba1e4 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 22:39:53 +0100 fix typo and compile error Tested on OpenBSD.

add TODO

2023-12-20T21:37:40Z

commit e1243f806a094c73adcc8bb2dd8633ff852ba1e4 parent a749e990b529966883178e9cfe8ebfc6faec25b4 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 22:37:40 +0100 add TODO

flip puzzles if its black to move

2023-12-20T21:32:00Z

commit a749e990b529966883178e9cfe8ebfc6faec25b4 parent b50c708ac5b44591b62aaa443022625c3fdd44cb Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 22:32:00 +0100 flip puzzles if its black to move

command-line parsing for formats, add OpenBSD pledge

2023-12-20T21:31:43Z

commit b50c708ac5b44591b62aaa443022625c3fdd44cb parent 3d921c8e0e2011ae994e508e89fc71086fffd598 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 22:31:43 +0100 command-line parsing for formats, add OpenBSD pledge

option to flip the board

2023-12-20T20:54:11Z

commit 3d921c8e0e2011ae994e508e89fc71086fffd598 parent 3c9f4a2be304b3f0d197d69bea715ee0c9e29570 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 21:54:11 +0100 option to flip the board

remove double unneccesary reset

2023-12-20T20:16:57Z

commit 3c9f4a2be304b3f0d197d69bea715ee0c9e29570 parent cbf34cae81cb9545e3854c19eb15040f106ab02f Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 21:16:57 +0100 remove double unneccesary reset

make it easier to change the color theme for svg and tty

2023-12-20T20:16:42Z

commit cbf34cae81cb9545e3854c19eb15040f106ab02f parent b55e73ad95fbbe333cdac344ca25a84dc61151b0 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 21:16:42 +0100 make it easier to change the color theme for svg and tty

slightly improve ascii output for colored squares and highlighted squares

2023-12-20T20:07:30Z

commit b55e73ad95fbbe333cdac344ca25a84dc61151b0 parent 64c4e3aaecf348c2cb7c61f5569cae1a820d20db Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 21:07:30 +0100 slightly improve ascii output for colored squares and highlighted squares

detect en passant, add some tests for it

2023-12-20T19:35:16Z

commit 64c4e3aaecf348c2cb7c61f5569cae1a820d20db parent d69d3ff1075f952ebdd45af40e7580bb3003721f Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 20:35:16 +0100 detect en passant, add some tests for it

remove the ability to castle when the king or rook moves

2023-12-20T19:19:55Z

commit d69d3ff1075f952ebdd45af40e7580bb3003721f parent a0e61726e8e522f6731e6eb27e18856f4fde61fb Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 20:19:55 +0100 remove the ability to castle when the king or rook moves

fix incorrect (x,y) parameters for taking a piece

2023-12-20T19:19:38Z

commit a0e61726e8e522f6731e6eb27e18856f4fde61fb parent 4ccd78674dc439a488331c561af552b0b129d621 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 20:19:38 +0100 fix incorrect (x,y) parameters for taking a piece

expand tests for castling etc

2023-12-20T19:19:08Z

commit 4ccd78674dc439a488331c561af552b0b129d621 parent 732bc42efda65c2ecc30a416f20516b9fcca62f6 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 20:19:08 +0100 expand tests for castling etc

add a useful reference about the PGN and FEN formats etc

2023-12-20T18:30:21Z

commit 732bc42efda65c2ecc30a416f20516b9fcca62f6 parent 53bf056699cba0e1bd1b06260600385ac5ad0780 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 19:30:21 +0100 add a useful reference about the PGN and FEN formats etc From archive.org

add initial tests

2023-12-20T18:29:59Z

commit 53bf056699cba0e1bd1b06260600385ac5ad0780 parent aaac499d48085948814415956d3eb4ded33eb704 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 19:29:59 +0100 add initial tests To make it easier to test the parser and moves

when moving the king or castling remove the ability to castle

2023-12-20T18:26:30Z

commit aaac499d48085948814415956d3eb4ded33eb704 parent dab21427a28e5561843d56cb4de324cddd4c53c7 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 19:26:30 +0100 when moving the king or castling remove the ability to castle + a pedantic ctype fix.

improve move number parsing

2023-12-20T18:26:23Z

commit dab21427a28e5561843d56cb4de324cddd4c53c7 parent 30a2ab3dd2979115341beaedc6d4a4918541036a Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 19:26:23 +0100 improve move number parsing

add OnlyFENs output option for the current board state

2023-12-20T17:50:33Z

commit 30a2ab3dd2979115341beaedc6d4a4918541036a parent 0bf730b426ada19f487f1791faf13269989abc04 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 18:50:33 +0100 add OnlyFENs output option for the current board state Maybe I'll use this for automatic testing later

make command-line arguments more flexible

2023-12-20T17:50:17Z

commit 0bf730b426ada19f487f1791faf13269989abc04 parent 132c4a50aae9c410bf3b505f4c61b322c388cf83 Author: Hiltjo Posthuma Date: Wed, 20 Dec 2023 18:50:17 +0100 make command-line arguments more flexible

improve and extend FEN parsing and FEN output

2023-12-19T19:11:09Z

commit 132c4a50aae9c410bf3b505f4c61b322c388cf83 parent 29822d687c7eed634e2fd6b480ddbf84cbabf4c2 Author: Hiltjo Posthuma Date: Tue, 19 Dec 2023 20:11:09 +0100 improve and extend FEN parsing and FEN output - improve castling availability: no castle detection yet. - initial halfmove and move number parsing. - parse enpassant move, but no enpassant detection yet. - increase move number by a move by black. work in progress

README: update filenames

2023-12-18T23:50:04Z

commit 29822d687c7eed634e2fd6b480ddbf84cbabf4c2 parent d7273cde403340578a406a58fc419ae03277a84f Author: Hiltjo Posthuma Date: Tue, 19 Dec 2023 00:50:04 +0100 README: update filenames

merge code together, symlink binaries

2023-12-18T23:49:17Z

commit d7273cde403340578a406a58fc419ae03277a84f parent 318de62766d2fd0caa0594f939cd1b2d9d143e0a Author: Hiltjo Posthuma Date: Tue, 19 Dec 2023 00:49:17 +0100 merge code together, symlink binaries

allow "startpos" for FEN for the starting position

2023-12-18T23:33:27Z

commit 318de62766d2fd0caa0594f939cd1b2d9d143e0a parent d1450a9bf4d9b009733094038420a82a6872a8ae Author: Hiltjo Posthuma Date: Tue, 19 Dec 2023 00:33:27 +0100 allow "startpos" for FEN for the starting position

implement detecting castling for moves

2023-12-18T23:31:55Z

commit d1450a9bf4d9b009733094038420a82a6872a8ae parent 09a541233ed6f1abf9f4498b37d1281a78f65ce8 Author: Hiltjo Posthuma Date: Tue, 19 Dec 2023 00:31:55 +0100 implement detecting castling for moves

separate function to check a valid piece character

2023-12-18T23:31:34Z

commit 09a541233ed6f1abf9f4498b37d1281a78f65ce8 parent 5df80ee4eebb2000bcac5530f58e6c84e9b92818 Author: Hiltjo Posthuma Date: Tue, 19 Dec 2023 00:31:34 +0100 separate function to check a valid piece character

generate.sh: add initial solutions/spoiler page

2023-12-18T21:16:22Z

commit 5df80ee4eebb2000bcac5530f58e6c84e9b92818 parent 098952703cf713b7569ae0cb826a08a239e3b46a Author: Hiltjo Posthuma Date: Mon, 18 Dec 2023 22:16:22 +0100 generate.sh: add initial solutions/spoiler page

fen_to_*.c: handle possible piece promotion for moves

2023-12-18T21:15:46Z

commit 098952703cf713b7569ae0cb826a08a239e3b46a parent b8fe22e0b3297f81eca81b3c5ad8f2fd7e918c38 Author: Hiltjo Posthuma Date: Mon, 18 Dec 2023 22:15:46 +0100 fen_to_*.c: handle possible piece promotion for moves

fen_to_tty: make showcoords = 0 work properly

2023-12-18T14:55:04Z

commit b8fe22e0b3297f81eca81b3c5ad8f2fd7e918c38 parent 26d727fe71a7e77b2eb1f733e2ad738b52089c54 Author: Hiltjo Posthuma Date: Mon, 18 Dec 2023 15:55:04 +0100 fen_to_tty: make showcoords = 0 work properly

fen_to_tty: add initial tty version

2023-12-18T14:51:15Z

commit 26d727fe71a7e77b2eb1f733e2ad738b52089c54 parent 59753af31b403f30db84f07562d2614460a2d9ab Author: Hiltjo Posthuma Date: Mon, 18 Dec 2023 15:51:15 +0100 fen_to_tty: add initial tty version