rnb1kbr1/ppq1p2p/2pp1p2/1B4pn/4P1PN/NP1P4/P1PQ1P1P/R1B2RK1 w q - 3 13
FEN state: rnb1kbr1/ppq1p2p/2pp1p2/1B4pn/4P1PN/NP1P4/P1PQ1P1P/R1B2RK1 w q - 3 13 ; Best move: b5c4
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 rook at g8. Black pawn at a7, black pawn at b7, black queen at c7, black pawn at e7 and black pawn at h7. Black pawn at c6, black pawn at d6 and black pawn at f6. White bishop at b5, black pawn at g5 and black knight at h5. White pawn at e4, white pawn at g4 and white knight at h4. White knight at a3, white pawn at b3 and white pawn at d3. White pawn at a2, white pawn at c2, white queen at d2, white pawn at f2 and white pawn at h2. White rook at a1, white bishop at c1, white rook at f1 and white king at g1. Black queenside is the only castle move available. Half move number is 3. Full move number is 13. White to move.