Search checking captures early in drop variants

Search checking captures early in drop variants

crazyhouse STC (yellow)
LLR: -2.96 (-2.94,2.94) [0.00,10.00]
Total: 19119 W: 9373 L: 9198 D: 548
http://www.variantfishtest.org:6543/tests/view/5d93b6486e23db3768ec0881

crazyhouse LTC
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 5822 W: 2894 L: 2711 D: 217
http://www.variantfishtest.org:6543/tests/view/5d94cc056e23db3768ec0892

crazyhouse VLTC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 10293 W: 5048 L: 4802 D: 443
http://www.variantfishtest.org:6543/tests/view/5d97772d6e23db3768ec0898