0.2.4

Principal Variation Search
Search is roughly 20-30% faster for the same depth (with the same results) according to strategic tests
Dual v0.2.3 Depth 6 - 1724 ELO, 11min 9s
Dual v0.2.4 Depth 6 - 1724 ELO, 8min 1s

Combat strength:
Dual v0.2.4: 53.1% - 9-33-6
Dual v0.2.3: 50:0% - 8-32-8
Maia-1700: 46.9% - 7-31-10