rnb1k1r1/4ppbp/pNp1q3/1P1p2p1/2QP2n1/P3P1P1/2PK1P1P/R1B2BNR w q - 0 13
FEN state: rnb1k1r1/4ppbp/pNp1q3/1P1p2p1/2QP2n1/P3P1P1/2PK1P1P/R1B2BNR w q - 0 13 ; Best move: b6a8
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8 and black rook at g8. Black pawn at e7, black pawn at f7, black bishop at g7 and black pawn at h7. Black pawn at a6, white knight at b6, black pawn at c6 and black queen at e6. White pawn at b5, black pawn at d5 and black pawn at g5. White queen at c4, white pawn at d4 and black knight at g4. White pawn at a3, white pawn at e3 and white pawn at g3. White pawn at c2, white king at d2, white pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, 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.