Just maintain a halfmove_number#1051
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codedeliveryservice merged 6 commits intoMay 28, 2026
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bench 2756239
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Fullmove and side to move can both be easily calculated from there. This is less work to make/unmake moves. Note the linguistic change. Some of you guys seem to prefer using "half_move" as a 50 move rule counter, but I have opted to use fiftymove_clock, and half_move as an actual literal half_move.
STC
Elo | 2.21 +- 2.31 (95%)
SPRT | 8.0+0.08s Threads=1 Hash=16MB
LLR | 2.99 (-2.25, 2.89) [-2.75, 0.25]
Games | N: 20912 W: 5427 L: 5294 D: 10191
Penta | [57, 2212, 5790, 2335, 62]
https://recklesschess.space/test/15051/
bench 2756239