r2qk2r/1npp1p1p/p3pnb1/1P4p1/Qb1P4/1PP2N2/4PPPP/RNB1KB1R w KQkq - 1 13
FEN state: r2qk2r/1npp1p1p/p3pnb1/1P4p1/Qb1P4/1PP2N2/4PPPP/RNB1KB1R w KQkq - 1 13 ; Best move: a4b4
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8 and black rook at h8. Black knight at b7, black pawn at c7, black pawn at d7, black pawn at f7 and black pawn at h7. Black pawn at a6, black pawn at e6, black knight at f6 and black bishop at g6. White pawn at b5 and black pawn at g5. White queen at a4, black bishop at b4 and white pawn at d4. White pawn at b3, white pawn at c3 and white knight at f3. White pawn at e2, white pawn at f2, white pawn at g2 and white pawn at h2. White rook at a1, white knight at b1, white bishop at c1, white king at e1, white bishop at f1 and white rook at h1. White kingside, white queenside, black kingside and black queenside castles are available. Half move number is 1. Full move number is 13. White to move.