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Fix the handling of opposite bishops in KXK endgame evaluation
The case of three or more bishops against a long king must look at all of the bishops and not just the first two in the piece lists. This patch makes sure that the position is treated as a win when there are bishops on opposite colors. This functional change is very small because bench remains the same. LLR: 2.95 (-2.94,2.94) [-4.00,0.00] Total: 24249 W: 4349 L: 4275 D: 15625 http://tests.stockfishchess.org/tests/view/598186530ebc5916ff64a218 Bench: 5608839
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