rn1qkr2/Bb1ppp1p/2p4b/1p2P2n/P4PpP/R1PP3R/1P1QB1P1/1N2K1N1 w q - 4 20
FEN state: rn1qkr2/Bb1ppp1p/2p4b/1p2P2n/P4PpP/R1PP3R/1P1QB1P1/1N2K1N1 w q - 4 20 ; Best move: e2g4
The current state of the chess board is: Black rook at a8, black knight at b8, black queen at d8, black king at e8 and black rook at f8. White bishop at a7, black bishop at b7, black pawn at d7, black pawn at e7, black pawn at f7 and black pawn at h7. Black pawn at c6 and black bishop at h6. Black pawn at b5, white pawn at e5 and black knight at h5. White pawn at a4, white pawn at f4, black pawn at g4 and white pawn at h4. White rook at a3, white pawn at c3, white pawn at d3 and white rook at h3. White pawn at b2, white queen at d2, white bishop at e2 and white pawn at g2. White knight at b1, white king at e1 and white knight at g1. Black queenside is the only castle move available. Half move number is 4. Full move number is 20. White to move.