Modern Defense: Bishop Attack, Monkey's Bum
1. e4 g6 2. Bc4 Bg7 3. Qf3 e6 4. d4 Bxd4
The Modern Defense: Bishop Attack, Monkey's Bum is a chess opening classified as ECO B06, reached after 1. e4 g6 2. Bc4 Bg7 3. Qf3 e6 4. d4 Bxd4. It is a line of the Modern Defense. White is to move.
In 12.6 million rated Lichess games (blitz and slower), this position was reached 24 times by this move order. White won 33%, 0% were drawn and Black won 67%. The most popular continuation is 5. c3 (33% of games).
Engine evaluation: −0.88 (Stockfish, depth 44; best line 5. Nc3 Nc6 6. Bd2 d6 7. h4 a6)
- ECO
- B06
- Moves
- 8 plies
- FEN
rnbqk1nr/pppp1p1p/4p1p1/8/2BbP3/5Q2/PPP2PPP/RNB1K1NR w KQkq - 0 5- PGN
1. e4 g6 2. Bc4 Bg7 3. Qf3 e6 4. d4 Bxd4
Analyse with Stockfish · Board image (SVG) · Open on Lichess
Results by rating
| Average rating | Games | White / draw / Black |
|---|---|---|
| 0-1499 | 15 | |
| 1500-1999 | 8 | |
| 2000+ | 1 | |
| All | 24 |
Most played moves
| Move | Games | White / draw / Black |
|---|---|---|
| 5. c3 | 8 (33%) | |
| 5. Ne2 | 7 (29%) | |
| 5. Be3 | 5 (21%) | |
| 5. h4 | 2 (8%) | |
| 5. Bg5 | 1 (4%) |
Master games
7 over-the-board games are classified under this line (White 29%, draw 0%, Black 71%). The strongest:
- IM Levy Rozman (2322) – GM Aram Hakobyan (2616) 0-1 · Titled Tue 26th Sep Late · 2023-09-26
- IM Levy Rozman (2343) – IM Sabir Umarov (2364) 1-0 · Titled Tuesday 10th Nov · 2020-11-10
- IM Shamil Arslanov (2410) – FM Denyefa Callistus EYETONGHAN (2256) 1-0 · Titled Tue 25th Aug 2026 · 2026-08-25
- IM Levy Rozman (2322) – FM Alejandro Domingo Nunez (2338) 0-1 · Titled Tue 16th May Early · 2023-05-16
- IM Levy Rozman (2322) – FM Marco Dobrikov (2228) 0-1 · Titled Tue 24th Jan Late · 2023-01-24
Search all games of the Modern Defense: Bishop Attack, Monkey's Bum and its sub-variations
Highest-rated Lichess games
- rhayted (2050) – Nma_Hassan (2080) 1-0 · 2026-09-02 · 300 + 0s
- KmHaykaliYoussouf (1530) – zen015100 (2231) 0-1 · 2026-09-01 · 600 + 0s
- daftpenguin (1834) – TemiV (1889) 0-1 · 2026-09-04 · 180 + 2s
Comes from
Modern Defense (1. e4 g6) 1. e4 g6
More Modern Defense lines (all)
- Modern Defense: Semi-Averbakh Variation, Polish Variation A04
- Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation A04
- Modern Defense: Semi-Averbakh Variation, Pterodactyl Variation Accepted A04
- Modern Defense: Beefeater Variation A40
- Modern Defense: Lizard Defense, Pirc-Diemer Gambit A40
- Modern Defense (3. Nc3 d6) A41
- Modern Defense: Neo-Modern Defense A41
- Modern Defense: Averbakh System A42
- Modern Defense: Averbakh Variation, Pseudo-Sämisch A42
- Modern Defense: Kotov Variation A42
- Modern Defense: Randspringer Variation A42
- Modern Defense (2. d4 Bg7) B06
Opening names and moves from the Lichess openings dataset; statistics from the Lichess open database, 2026-09 (CC0), sample of 12.6 million games, bots excluded; evaluations from Lichess cloud analysis (all CC0). Master games from The Week in Chess #920–#1664 by Mark Crowther, used with permission.