r2qkb1r/pp2pppp/nN1p2b1/8/1p2P1n1/B2P1NPB/P1P2PKP/R2Q3R w k - 1 13
FEN state: r2qkb1r/pp2pppp/nN1p2b1/8/1p2P1n1/B2P1NPB/P1P2PKP/R2Q3R w k - 1 13 ; Best move: b6a8
The current state of the chess board is: Black rook at a8, black queen at d8, black king at e8, black bishop at f8 and black rook at h8. Black pawn at a7, black pawn at b7, black pawn at e7, black pawn at f7, black pawn at g7 and black pawn at h7. Black knight at a6, white knight at b6, black pawn at d6 and black bishop at g6. Black pawn at b4, white pawn at e4 and black knight at g4. White bishop at a3, white pawn at d3, white knight at f3, white pawn at g3 and white bishop at h3. White pawn at a2, white pawn at c2, white pawn at f2, white king at g2 and white pawn at h2. White rook at a1, white queen at d1 and white rook at h1. Black kingside is the only castle move available. Half move number is 1. Full move number is 13. White to move.