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- ArnoHu
-
Scratcher
1000+ posts
Scratch Chess Engine - Game of Kings
GoK Classic vs. Wolverine, 96% vs. 92%:
https://lichess.org/study/SaWdnTo2/aO9x4U1b
GoK Classic vs. White Dove, 91% vs. 88%:
https://lichess.org/study/SaWdnTo2/VQnEaCQP
GoK Classic vs. Black Crow, 95% vs. 91%:
https://lichess.org/study/SaWdnTo2/kmFnI52B
https://lichess.org/study/SaWdnTo2/aO9x4U1b
GoK Classic vs. White Dove, 91% vs. 88%:
https://lichess.org/study/SaWdnTo2/VQnEaCQP
GoK Classic vs. Black Crow, 95% vs. 91%:
https://lichess.org/study/SaWdnTo2/kmFnI52B
Last edited by ArnoHu (Nov. 28, 2025 23:56:00)
- waabooboo
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
Kaufman Test with current GoK Classic:Problem Found Nodecount (k) Comment
1: Y 4,154
2: Y 155
3: Y 7 Lost again at 101k
4: Y 1,127
5: Y 248
6: Y 0 Lost again at 22k
7: Y 253
8: Y 1341
9: Y 397
10: Y 40
11: Y 131
12:
13: Y 618
14: Y 1,859
15: Y 285
16: Y 106
17: Y 167
18:
19: Y 59
20: Y 565
21:
22: Y 2
23: Y 1 Lost again at 647k
24: Y 52
25:
Nice! 21-25 are really more about endgame knowledge than tactical strength. 25 seems particularly tough for HCE engines – the king and pawn ending is clearly winning, but the engines have to calculate very deeply before trading for the “weak” minor piece.
21 is a bit broken, looks like it's a tablebase win for black no matter what. But any sane human player takes the knight, because you have much better practical drawing chances with the bishop endgame.
New Wolverine version released today – I got LMP working and retuned the search parameters. I'll run it through the gauntlet, see if the 17/25 can be improved upon

- waabooboo
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
Kaufman Test with current GoK Classic:Problem Found Nodecount (k) Comment
1: Y 4,154
2: Y 155
3: Y 7 Lost again at 101k
4: Y 1,127
5: Y 248
6: Y 0 Lost again at 22k
7: Y 253
8: Y 1341
9: Y 397
10: Y 40
11: Y 131
12:
13: Y 618
14: Y 1,859
15: Y 285
16: Y 106
17: Y 167
18:
19: Y 59
20: Y 565
21:
22: Y 2
23: Y 1 Lost again at 647k
24: Y 52
25:
Nice! 21-25 are really more about endgame knowledge than tactical strength. 25 seems particularly tough for HCE engines – the king and pawn ending is clearly winning, but the engines have to calculate very deeply before trading for the “weak” minor piece.
21 is a bit broken, looks like it's a tablebase win for black no matter what. But any sane human player takes the knight, because you have much better practical drawing chances with the bishop endgame.
New Wolverine version released today – I got LMP working and retuned the search parameters. I'll run it through the gauntlet, see if the 17/25 can be improved upon
For the new Wolverine:
1) 3504k
2) 446k
3) 649k
4) 290k
5) 110k
6) 220k
7) 198k
8) 1995k
9) 546k
10) Not found within 10M nodes
11) 661k
12) 435k
13) 69k
14) 2047k
15) 1039k
16) 261k
17) 1076k
18) Not found within 10M nodes
19) Not found within 10M nodes
20) 1075k
21) 0k
22) 0k
23) 0k, but discarded later
24) 0k
25) Not found within 10M nodes
- ArnoHu
-
Scratcher
1000+ posts
Scratch Chess Engine - Game of Kings
Kaufman Test with current GoK Classic:Problem Found Nodecount (k) Comment
1: Y 4,154
2: Y 155
3: Y 7 Lost again at 101k
4: Y 1,127
5: Y 248
6: Y 0 Lost again at 22k
7: Y 253
8: Y 1341
9: Y 397
10: Y 40
11: Y 131
12:
13: Y 618
14: Y 1,859
15: Y 285
16: Y 106
17: Y 167
18:
19: Y 59
20: Y 565
21:
22: Y 2
23: Y 1 Lost again at 647k
24: Y 52
25:
Nice! 21-25 are really more about endgame knowledge than tactical strength. 25 seems particularly tough for HCE engines – the king and pawn ending is clearly winning, but the engines have to calculate very deeply before trading for the “weak” minor piece.
21 is a bit broken, looks like it's a tablebase win for black no matter what. But any sane human player takes the knight, because you have much better practical drawing chances with the bishop endgame.
New Wolverine version released today – I got LMP working and retuned the search parameters. I'll run it through the gauntlet, see if the 17/25 can be improved upon
Congrats to the new Wolverine version, it looks very strong.
The previous GoK Classic was lucky to draw these two games:
https://lichess.org/study/SaWdnTo2/ye99xDJU
https://lichess.org/study/SaWdnTo2/P2WeK47m
I then improved and reactivated internal iterative deepening and internal iterative reductions, and Classic managed to win on the same opening, still quite a fight at 91% vs. 88%:
https://lichess.org/study/SaWdnTo2/o4Z1KWVx
And after two evaluation bugfixes, 95% vs. 91%:
https://lichess.org/study/SaWdnTo2/cY0AaaSI
Last edited by ArnoHu (Nov. 29, 2025 16:56:14)
- waabooboo
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
Kaufman Test with current GoK Classic:Problem Found Nodecount (k) Comment
1: Y 4,154
2: Y 155
3: Y 7 Lost again at 101k
4: Y 1,127
5: Y 248
6: Y 0 Lost again at 22k
7: Y 253
8: Y 1341
9: Y 397
10: Y 40
11: Y 131
12:
13: Y 618
14: Y 1,859
15: Y 285
16: Y 106
17: Y 167
18:
19: Y 59
20: Y 565
21:
22: Y 2
23: Y 1 Lost again at 647k
24: Y 52
25:
Nice! 21-25 are really more about endgame knowledge than tactical strength. 25 seems particularly tough for HCE engines – the king and pawn ending is clearly winning, but the engines have to calculate very deeply before trading for the “weak” minor piece.
21 is a bit broken, looks like it's a tablebase win for black no matter what. But any sane human player takes the knight, because you have much better practical drawing chances with the bishop endgame.
New Wolverine version released today – I got LMP working and retuned the search parameters. I'll run it through the gauntlet, see if the 17/25 can be improved upon
Congrats to the new Wolverine version, it looks very strong.
The previous GoK Classic was lucky to draw these two games:
https://lichess.org/study/SaWdnTo2/ye99xDJU
https://lichess.org/study/SaWdnTo2/P2WeK47m
I then improved and reactivated internal iterative deepening and internal iterative reductions, and Classic managed to win on the same opening, still quite a fight at 91% vs. 88%:
https://lichess.org/study/SaWdnTo2/o4Z1KWVx
And after two evaluation bugfixes, 95% vs. 91%:
https://lichess.org/study/SaWdnTo2/cY0AaaSI
Thanks! I'll work on search a bit more – Wolverine still can't solve test position #19, which GoK got quickly. Probably a futility pruning thing, I'll take a look… And there's still work to do on the evaluation

- ArnoHu
-
Scratcher
1000+ posts
Scratch Chess Engine - Game of Kings
Kaufman Test with current GoK Classic:Problem Found Nodecount (k) Comment
1: Y 4,154
2: Y 155
3: Y 7 Lost again at 101k
4: Y 1,127
5: Y 248
6: Y 0 Lost again at 22k
7: Y 253
8: Y 1341
9: Y 397
10: Y 40
11: Y 131
12:
13: Y 618
14: Y 1,859
15: Y 285
16: Y 106
17: Y 167
18:
19: Y 59
20: Y 565
21:
22: Y 2
23: Y 1 Lost again at 647k
24: Y 52
25:
Nice! 21-25 are really more about endgame knowledge than tactical strength. 25 seems particularly tough for HCE engines – the king and pawn ending is clearly winning, but the engines have to calculate very deeply before trading for the “weak” minor piece.
21 is a bit broken, looks like it's a tablebase win for black no matter what. But any sane human player takes the knight, because you have much better practical drawing chances with the bishop endgame.
New Wolverine version released today – I got LMP working and retuned the search parameters. I'll run it through the gauntlet, see if the 17/25 can be improved upon
Congrats to the new Wolverine version, it looks very strong.
The previous GoK Classic was lucky to draw these two games:
https://lichess.org/study/SaWdnTo2/ye99xDJU
https://lichess.org/study/SaWdnTo2/P2WeK47m
I then improved and reactivated internal iterative deepening and internal iterative reductions, and Classic managed to win on the same opening, still quite a fight at 91% vs. 88%:
https://lichess.org/study/SaWdnTo2/o4Z1KWVx
And after two evaluation bugfixes, 95% vs. 91%:
https://lichess.org/study/SaWdnTo2/cY0AaaSI
Thanks! I'll work on search a bit more – Wolverine still can't solve test position #19, which GoK got quickly. Probably a futility pruning thing, I'll take a look… And there's still work to do on the evaluation
Two more games with current versions:
https://lichess.org/study/SaWdnTo2/R3EWhRqV
https://lichess.org/study/SaWdnTo2/T1PXShRm
Last edited by ArnoHu (Nov. 30, 2025 08:52:54)
- ArnoHu
-
Scratcher
1000+ posts
Scratch Chess Engine - Game of Kings
GoK Classic has just been updated.
GoK Classic vs. White Dove, 93% vs. 90%:
https://lichess.org/study/SaWdnTo2/VIKihROw
GoK Classic vs. Wolverine 2, 96% vs. 91%:
https://lichess.org/study/SaWdnTo2/T1PXShRm
GoK Classic vs. Black Crow, 90% vs. 91%:
https://lichess.org/study/SaWdnTo2/kzkdF7Tx
GoK Classic vs. TurboKnight 5, 91% vs. 89%:
https://lichess.org/study/SaWdnTo2/hsiOa53c
GoK Classic vs. Wolverine 2, 93% vs. 87%:
https://lichess.org/study/SaWdnTo2/O9jpMC3t
GoK Classic vs. Delta, 97% vs. 89%:
https://lichess.org/study/SaWdnTo2/XQ2dgj4U
GoK Classic vs. Shallow Blue 3 NNUE, 93% vs. 90%:
https://lichess.org/study/SaWdnTo2/U1VwFQpS
GoK Classic vs. White Dove, 98% vs. 92%:
https://lichess.org/study/SaWdnTo2/N0Im9Cjc
Two improvements merged to GoK NNUE:
GoK NNUE vs. Black Crow, 98% vs. 94%:
https://lichess.org/study/SaWdnTo2/JUhj2fEe
GoK Classic vs. White Dove, 93% vs. 90%:
https://lichess.org/study/SaWdnTo2/VIKihROw
GoK Classic vs. Wolverine 2, 96% vs. 91%:
https://lichess.org/study/SaWdnTo2/T1PXShRm
GoK Classic vs. Black Crow, 90% vs. 91%:
https://lichess.org/study/SaWdnTo2/kzkdF7Tx
GoK Classic vs. TurboKnight 5, 91% vs. 89%:
https://lichess.org/study/SaWdnTo2/hsiOa53c
GoK Classic vs. Wolverine 2, 93% vs. 87%:
https://lichess.org/study/SaWdnTo2/O9jpMC3t
GoK Classic vs. Delta, 97% vs. 89%:
https://lichess.org/study/SaWdnTo2/XQ2dgj4U
GoK Classic vs. Shallow Blue 3 NNUE, 93% vs. 90%:
https://lichess.org/study/SaWdnTo2/U1VwFQpS
GoK Classic vs. White Dove, 98% vs. 92%:
https://lichess.org/study/SaWdnTo2/N0Im9Cjc
Two improvements merged to GoK NNUE:
GoK NNUE vs. Black Crow, 98% vs. 94%:
https://lichess.org/study/SaWdnTo2/JUhj2fEe
Last edited by ArnoHu (Nov. 30, 2025 22:34:11)
- coooolboy55
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
Connect 4 Bot Game SeriesWill you be running another Connect 4 tournament?
I am conducting a Connect 4 Bot test game series played by Game of Connect (GoC).
The results will be updated in this posting over time. They will cover the Scratch runtime and TurboWarp (TW only if an engine takes advantage of the additional performance there), with both sides as starting players once (as far as the projects allow). When several playing levels exist, games will be played on highest level available for the runtime.
The Bots
- Connect 4 - “GoC”: https://scratch.mit.edu/projects/1114744709/ (by ArnoHu)
- Connect Four AI: https://scratch.mit.edu/projects/1109505895 (by BirdRacerThree)
- Connect 4 AI (GreenLocked): https://scratch.mit.edu/projects/42395968 (by PullJosh)
- Connect 4 AI: https://scratch.mit.edu/projects/802293688 (by Spentine)
- Online Connect 4: https://scratch.mit.edu/projects/685271634 (by AnotherKidOnScratch)
- Connect 4 vs. Computer: https://scratch.mit.edu/projects/16243147 (by A_big_cow)
Scratch 3Starting Side Responding Side
GoC - CFAI (BirdRacer) 1 - 0 (win at ply 41)
GoC - C4AI (Spentine) 1 - 0 (win at ply 29)
GoC - C4AI-GL (PullJosh) 1 - 0 (win at ply 25)
GoC - OC4 (AKOS) 1 - 0 (win at ply 33)
GoC - OC4VC (ABC) 1 - 0 (win at ply 31)
CFAI (BirdRacer) - GoC 0.5 - 0.5
C4AI (Spentine) - GoC 0 - 1 (loss at ply 34)
TurboWarpStarting Side Responding Side
GoC - CFAI (BirdRacer) 1 - 0 (win at ply 31)
GoC - C4AI (Spentine) 1 - 0 (win at ply 39)
CFAI (BirdRacer) - GoC 0.5 - 0.5
C4AI (Spentine) - GoC 0 - 1 (loss at ply 42)
Note: GoC and BirdRacer's CFAI are think-time bound, hence not deterministic. They will play according to system speed (means, better on faster systems).
If you reply to this post, I suggest to link to it and remove the copied content, otherwise we will have outdated results copied over the forum. Here is the link to the original: https://scratch.mit.edu/discuss/post/8319884/
- waabooboo
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
https://lichess.org/study/SaWdnTo2/57T1Kkle
Ok, this one's pretty egregious. That endgame is an easy draw, just keep the black king in the light squared corner and sac bishop for g pawn. I didn't bother adding special knowledge for drawn KPB v K endgames, maybe I should… But Wolverine should be able to draw that through calculation alone, just avoiding the paths where white queens.
Ok, this one's pretty egregious. That endgame is an easy draw, just keep the black king in the light squared corner and sac bishop for g pawn. I didn't bother adding special knowledge for drawn KPB v K endgames, maybe I should… But Wolverine should be able to draw that through calculation alone, just avoiding the paths where white queens.
- ArnoHu
-
Scratcher
1000+ posts
Scratch Chess Engine - Game of Kings
GoK Classic has just been updated.
GoK Classic vs. White Dove, 93% vs. 90%:
https://lichess.org/study/SaWdnTo2/VIKihROw
GoK Classic vs. Wolverine 2, 96% vs. 91%:
https://lichess.org/study/SaWdnTo2/T1PXShRm
GoK Classic vs. Black Crow, 90% vs. 91%:
https://lichess.org/study/SaWdnTo2/kzkdF7Tx
GoK Classic vs. TurboKnight 5, 91% vs. 89%:
https://lichess.org/study/SaWdnTo2/hsiOa53c
GoK Classic vs. Wolverine 2, 93% vs. 87%:
https://lichess.org/study/SaWdnTo2/O9jpMC3t
GoK Classic vs. Delta, 97% vs. 89%:
https://lichess.org/study/SaWdnTo2/XQ2dgj4U
GoK Classic vs. Shallow Blue 3 NNUE, 93% vs. 90%:
https://lichess.org/study/SaWdnTo2/U1VwFQpS
GoK Classic vs. White Dove, 98% vs. 92%:
https://lichess.org/study/SaWdnTo2/N0Im9Cjc
Two improvements merged to GoK NNUE:
GoK NNUE vs. Black Crow, 98% vs. 94%:
https://lichess.org/study/SaWdnTo2/JUhj2fEe
GoK Classic update:
GoK Classic vs. Wolverine 2, 96% vs. 93%:
https://lichess.org/study/SaWdnTo2/35WL1dFZ
- Destructor_chess
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
I mean, if one day I do a connect 4 bot, I will.Connect 4 Bot Game SeriesWill you be running another Connect 4 tournament?
I am conducting a Connect 4 Bot test game series played by Game of Connect (GoC).
The results will be updated in this posting over time. They will cover the Scratch runtime and TurboWarp (TW only if an engine takes advantage of the additional performance there), with both sides as starting players once (as far as the projects allow). When several playing levels exist, games will be played on highest level available for the runtime.
The Bots
- Connect 4 - “GoC”: https://scratch.mit.edu/projects/1114744709/ (by ArnoHu)
- Connect Four AI: https://scratch.mit.edu/projects/1109505895 (by BirdRacerThree)
- Connect 4 AI (GreenLocked): https://scratch.mit.edu/projects/42395968 (by PullJosh)
- Connect 4 AI: https://scratch.mit.edu/projects/802293688 (by Spentine)
- Online Connect 4: https://scratch.mit.edu/projects/685271634 (by AnotherKidOnScratch)
- Connect 4 vs. Computer: https://scratch.mit.edu/projects/16243147 (by A_big_cow)
Scratch 3Starting Side Responding Side
GoC - CFAI (BirdRacer) 1 - 0 (win at ply 41)
GoC - C4AI (Spentine) 1 - 0 (win at ply 29)
GoC - C4AI-GL (PullJosh) 1 - 0 (win at ply 25)
GoC - OC4 (AKOS) 1 - 0 (win at ply 33)
GoC - OC4VC (ABC) 1 - 0 (win at ply 31)
CFAI (BirdRacer) - GoC 0.5 - 0.5
C4AI (Spentine) - GoC 0 - 1 (loss at ply 34)
TurboWarpStarting Side Responding Side
GoC - CFAI (BirdRacer) 1 - 0 (win at ply 31)
GoC - C4AI (Spentine) 1 - 0 (win at ply 39)
CFAI (BirdRacer) - GoC 0.5 - 0.5
C4AI (Spentine) - GoC 0 - 1 (loss at ply 42)
Note: GoC and BirdRacer's CFAI are think-time bound, hence not deterministic. They will play according to system speed (means, better on faster systems).
If you reply to this post, I suggest to link to it and remove the copied content, otherwise we will have outdated results copied over the forum. Here is the link to the original: https://scratch.mit.edu/discuss/post/8319884/
- waabooboo
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
Made some more adjustments to the search parameters, Wolverine's tactical play should be even stronger now.
- coooolboy55
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
I have stopped working on my Chess AI. I really don't like creating it.
- ArnoHu
-
Scratcher
1000+ posts
Scratch Chess Engine - Game of Kings
GoK Classic - Shallow Blue 3 NNUE, 89% vs. 86%:
https://lichess.org/study/PJTsaIt9/ZyFQaV9d
GoK Classic - Wolverine 2, 86% vs. 83%:
https://lichess.org/study/PJTsaIt9/vVV4YDrr
https://lichess.org/study/PJTsaIt9/ZyFQaV9d
GoK Classic - Wolverine 2, 86% vs. 83%:
https://lichess.org/study/PJTsaIt9/vVV4YDrr
Last edited by ArnoHu (Dec. 4, 2025 10:38:27)
- waabooboo
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
GoK Classic - Shallow Blue 3 NNUE, 89% vs. 86%:
https://lichess.org/study/PJTsaIt9/ZyFQaV9d
GoK Classic - Wolverine 2 NNUE, 86% vs. 83%:
https://lichess.org/study/PJTsaIt9/vVV4YDrr
There's no Wolverine NNUE, unfortunately…
- iceysnowman
-
Scratcher
68 posts
Scratch Chess Engine - Game of Kings
I have stopped working on my Chess AI. I really don't like creating it.Noooooo! Too bad, it could have ended up really well. I at least hope you continue to work on your Connect 4 bot, it's a really nice project and it's pretty decent.
- Destructor_chess
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
I have stopped working on my Chess AI. I really don't like creating it.Ah… You can ask others, I said that too many times. But well, chess programming is too much attractive, you'll see.
Last edited by Destructor_chess (Dec. 4, 2025 15:56:43)
- Hi_Pro20155
-
Scratcher
5 posts
Scratch Chess Engine - Game of Kings
when green flag clicked
wait (3) secs
wait (3) secs
- Hi_Pro20155
-
Scratcher
5 posts
Scratch Chess Engine - Game of Kings
when green flag clicked
change [ v] by (Happy)
[/s[scratchblocks]
cratchblocks]
change [ v] by (sad)
[/scratchblocks]
- coooolboy55
-
Scratcher
100+ posts
Scratch Chess Engine - Game of Kings
I will keep working on that. There are many more features I can add.I have stopped working on my Chess AI. I really don't like creating it.Noooooo! Too bad, it could have ended up really well. I at least hope you continue to work on your Connect 4 bot, it's a really nice project and it's pretty decent.
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