rnb1kbn1/p1q1p2r/1Ppp3p/RP6/3P1pp1/2P1B1PN/3NPP1P/3QKBR1 b q - 1 13
FEN state: rnb1kbn1/p1q1p2r/1Ppp3p/RP6/3P1pp1/2P1B1PN/3NPP1P/3QKBR1 b q - 1 13 ; Best move: a7b6
The current state of the chess board is: Black rook at a8, black knight at b8, black bishop at c8, black king at e8, black bishop at f8 and black knight at g8. Black pawn at a7, black queen at c7, black pawn at e7 and black rook at h7. White pawn at b6, black pawn at c6, black pawn at d6 and black pawn at h6. White rook at a5 and white pawn at b5. White pawn at d4, black pawn at f4 and black pawn at g4. White pawn at c3, white bishop at e3, white pawn at g3 and white knight at h3. White knight at d2, white pawn at e2, white pawn at f2 and white pawn at h2. White queen at d1, white king at e1, white bishop at f1 and white rook at g1. Black queenside is the only castle move available. Half move number is 1. Full move number is 13. Black to move.