r1b1kbr1/pp1pp1pp/1N6/2p2pP1/PnP2P1n/3PK2P/1P2P3/R1BQ1BNR w q - 0 13
FEN state: r1b1kbr1/pp1pp1pp/1N6/2p2pP1/PnP2P1n/3PK2P/1P2P3/R1BQ1BNR w q - 0 13 ; Best move: b6a8
The current state of the chess board is: Black rook at a8, black bishop at c8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at b7, black pawn at d7, black pawn at e7, black pawn at g7 and black pawn at h7. White knight at b6. Black pawn at c5, black pawn at f5 and white pawn at g5. White pawn at a4, black knight at b4, white pawn at c4, white pawn at f4 and black knight at h4. White pawn at d3, white king at e3 and white pawn at h3. White pawn at b2 and white pawn at e2. White rook at a1, white bishop at c1, white queen at d1, white bishop at f1, white knight at g1 and white rook at h1. Black queenside is the only castle move available. Half move number is 0. Full move number is 13. White to move.