Tweak losing chess NMP reduction

Tweak losing chess NMP reduction

giveaway STC
LLR: 2.95 (-2.94,2.94) [0.00,10.00]
Total: 2636 W: 1055 L: 937 D: 644
http://www.variantfishtest.org:6543/tests/view/5ff074aa6e23db221d9e983e

giveaway LTC
LLR: 2.96 (-2.94,2.94) [0.00,10.00]
Total: 1224 W: 503 L: 405 D: 316
http://www.variantfishtest.org:6543/tests/view/5ff0d5056e23db221d9e9847

losers STC
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 1856 W: 882 L: 763 D: 211
http://www.variantfishtest.org:6543/tests/view/5ff08fe96e23db221d9e9843

losers LTC
LLR: 2.97 (-2.94,2.94) [0.00,10.00]
Total: 2315 W: 1067 L: 943 D: 305
http://www.variantfishtest.org:6543/tests/view/5ff0d4f66e23db221d9e9845