r1bq1b2/p1pppk1r/5n2/np3ppp/2PP4/PQN1BPPB/RP2P2P/4K1NR w K - 0 13
FEN state: r1bq1b2/p1pppk1r/5n2/np3ppp/2PP4/PQN1BPPB/RP2P2P/4K1NR w K - 0 13 ; Best move: b3b5
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8 and black bishop at f8. Black pawn at a7, black pawn at c7, black pawn at d7, black pawn at e7, black king at f7 and black rook at h7. Black knight at f6. Black knight at a5, black pawn at b5, black pawn at f5, black pawn at g5 and black pawn at h5. White pawn at c4 and white pawn at d4. White pawn at a3, white queen at b3, white knight at c3, white bishop at e3, white pawn at f3, white pawn at g3 and white bishop at h3. White rook at a2, white pawn at b2, white pawn at e2 and white pawn at h2. White king at e1, white knight at g1 and white rook at h1. White kingside is the only castle move available. Half move number is 0. Full move number is 13. White to move.