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Reintroduce late irreversible move extension
Reintroduce vondele's late irreversible move extension for fortress keeping. This was removed when we only had classical eval. Now that we have the NNUE net, it seems that this is useful again. STC: LLR: 2.93 (-2.94,2.94) {-0.50,1.50} Total: 5352 W: 787 L: 653 D: 3912 Ptnml(0-2): 34, 451, 1579, 571, 41 https://tests.stockfishchess.org/tests/view/5f2dc8ad61e3b6af64881ff0 LTC: LLR: 2.94 (-2.94,2.94) {0.25,1.75} Total: 14416 W: 1013 L: 891 D: 12512 Ptnml(0-2): 15, 722, 5623, 822, 26 https://tests.stockfishchess.org/tests/view/5f2e0e3661e3b6af6488201e closes https://github.com/official-stockfish/Stockfish/pull/2936 Bench: 4154696
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@ -1134,6 +1134,12 @@ moves_loop: // When in check, search starts from here
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// Castling extension
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if (type_of(move) == CASTLING)
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extension = 1;
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// Late irreversible move extension
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if ( move == ttMove
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&& pos.rule50_count() > 80
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&& (captureOrPromotion || type_of(movedPiece) == PAWN))
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extension = 2;
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// Add extension to new depth
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newDepth += extension;
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