Commits on Jan 4, 2019

1. Delay castling legality check …

   Delay legality check of castling moves at search time,
   just before making the move, as is the standard with all
   the other move types.
   
   This shoudl avoid an useless and not trivial legality check
   when the castling is then not tried later. For instance due
   to a previous cut-off.
   
   The patch is also a big simplification and allows to entirely
   remove generate_castling()
   
   Bench changes due to a different move's sequence out of
   MovePicker.
   
   STC:
   LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
   Total: 45073 W: 9918 L: 9843 D: 25312
   http://tests.stockfishchess.org/tests/view/5c2f176f0ebc596a450bdfb3
   
   LTC:
   LLR: 3.15 (-2.94,2.94) [-3.00,1.00]
   Total: 10156 W: 1707 L: 1560 D: 6889
   http://tests.stockfishchess.org/tests/view/5c2e7dfd0ebc596a450bcdf4
   
   Verified with perft both in standard and Chess960 cases.
   
   Bench: 3559104

   

   mcostalba committed Jan 4, 2019
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