rn2qbr1/p2k1p1p/bp5n/2p1p1p1/1P4P1/N3PP1N/P1PP3P/R1BQK2R w KQ - 1 10
FEN state: rn2qbr1/p2k1p1p/bp5n/2p1p1p1/1P4P1/N3PP1N/P1PP3P/R1BQK2R w KQ - 1 10 ; Best move: b4b5
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black king at d7, black pawn at f7 and black pawn at h7. Black bishop at a6, black pawn at b6 and black knight at h6. Black pawn at c5, black pawn at e5 and black pawn at g5. White pawn at b4 and white pawn at g4. White knight at a3, white pawn at e3, white pawn at f3 and white knight at h3. White pawn at a2, white pawn at c2, white pawn at d2 and white pawn at h2. White rook at a1, white bishop at c1, white queen at d1, white king at e1 and white rook at h1. White kingside and white queenside castles are available. Half move number is 1. Full move number is 10. White to move.