rn2k1nr/2p3pp/1pbp4/P3pP2/1bP4q/N4P1B/PR1PP2P/2BQ1KNR w kq - 1 13
FEN state: rn2k1nr/2p3pp/1pbp4/P3pP2/1bP4q/N4P1B/PR1PP2P/2BQ1KNR w kq - 1 13 ; Best move: b2b4
The current state of the chess board is: Black rook at a8, black knight at b8, black king at e8, black knight at g8 and black rook at h8. Black pawn at c7, black pawn at g7 and black pawn at h7. Black pawn at b6, black bishop at c6 and black pawn at d6. White pawn at a5, black pawn at e5 and white pawn at f5. Black bishop at b4, white pawn at c4 and black queen at h4. White knight at a3, white pawn at f3 and white bishop at h3. White pawn at a2, white rook at b2, white pawn at d2, white pawn at e2 and white pawn at h2. White bishop at c1, white queen at d1, white king at f1, white knight at g1 and white rook at h1. Black kingside and black queenside castles are available. Half move number is 1. Full move number is 13. White to move.