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Chess engine: Stockfish 21011709

on

Stockfish - UCI chess engine, compiled by Lolligerhans
Rating JCER=3090

Timestamp: 1610872559
Add penalty for doubled pawns in agile structure

Give an additional penalty of S(20, 10) for any doubled pawn if none of the opponent's pawns is facing any of our
- pawns or
- pawn attacks;
that means, each of their pawns can push at least one square without
being captured.
This ignores their non-pawns pieces and attacks.

One possible justification: Their pawns' ability to push freely provides options to react to our threats by changing their pawn structure. Our doubled pawns however will likely lead to an exploitable weakness, even if the pawn structure is not yet fixed.

Note that the notion of "their pawns not being fixed" is symmetric for both players: If all of their pawns can push freely so can ours. All pawns being freely pushable might just be an early-game-indicator. However, it can trigger during endgame pawns races, where doubled pawns
are especially hindering, too.

LTC
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 134976 W: 17964 L: 17415 D: 99597 Elo +1.41
Ptnml(0-2): 998, 12702, 39619, 13091, 1078
https://tests.stockfishchess.org/tests/view/5ffdd5316019e097de3ef281

STC
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 35640 W: 7219 L: 6904 D: 21517 Elo +3.07
Ptnml(0-2): 645, 4096, 8084, 4289, 706
https://tests.stockfishchess.org/tests/view/5ffda4a16019e097de3ef265
Bench: 4363873

Stockfish 21011709 and NNUE download

 

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