r1bqkbr1/p1p1p2p/1N3p1n/1p4p1/5P2/2Bp3P/P1nPP1P1/R1QK1BNR b q - 1 15
FEN state: r1bqkbr1/p1p1p2p/1N3p1n/1p4p1/5P2/2Bp3P/P1nPP1P1/R1QK1BNR b q - 1 15 ; Best move: a7b6
The current state of the chess board is: Black rook at a8, black bishop at c8, black queen at d8, black king at e8, black bishop at f8 and black rook at g8. Black pawn at a7, black pawn at c7, black pawn at e7 and black pawn at h7. White knight at b6, black pawn at f6 and black knight at h6. Black pawn at b5 and black pawn at g5. White pawn at f4. White bishop at c3, black pawn at d3 and white pawn at h3. White pawn at a2, black knight at c2, white pawn at d2, white pawn at e2 and white pawn at g2. White rook at a1, white queen at c1, white king 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 1. Full move number is 15. Black to move.