Openshogilib (osl) provides following features of shogi playing programs, especially for shogi programming study. shogi is a japanese two-player board game like chess. 1. board: reading/writing records, generating legal moves etc. 2. evaluation function: piece values and a lot of features 3. hash table: hashing boards etc. 4. checkmate search: concurrent df-pn+ etc. 5. search framework: full-depth search, realization probability etc. 6. move category: mate, illegal moves etc. 7. opening book 8. gaming: search time control etc.

osl works only on pentium4 or later compatible cpus due to using the sse2 instruction set.