Borg Defense

1. e4 g5

The Borg Defense is a chess opening classified as ECO B00, reached after 1. e4 g5. White is to move. 3 named lines continue from this position.

In 12.6 million rated Lichess games (blitz and slower), this position was reached 11,671 times by this move order. White won 49%, 3% were drawn and Black won 48%. The most popular continuation is 2. d4 (45% of games).

Engine evaluation: +1.41 (Stockfish, depth 38; best line 2. d4 h6 3. h4 g4 4. Nc3 d6)

ECO: B00
Moves: 2 plies
FEN: rnbqkbnr/pppppp1p/8/6p1/4P3/8/PPPP1PPP/RNBQKBNR w KQkq - 0 2
PGN: 1. e4 g5

Analyse with Stockfish · Board image (SVG) · Open on Lichess

Results by rating

Average rating	Games	White / draw / Black
0-1499	7,063	49%48%
1500-1999	4,208	49%47%
2000+	400	56%40%
All	11,671	49%48%

Most played moves

Move	Games	White / draw / Black
2. d4	5,287 (45%)	50%47%
2. Nf3	2,009 (17%)	48%49%
2. Bc4	1,341 (11%)	46%51%
2. Nc3	1,118 (10%)	51%46%
2. d3	477 (4%)	48%48%
2. e5	209 (2%)	50%44%
2. Qf3	155 (1%)	48%49%
2. Qh5	148 (1%)	51%43%

Master games

587 over-the-board games are classified under this line (White 51%, draw 8%, Black 41%). The strongest:

GM Rauf Mamedov (2646) – GM Magnus Carlsen (2856) 0-1 · Titled Tue 11th Oct Late · 2022-10-11
GM Etienne Bacrot (2646) – GM Hikaru Nakamura (2768) 0-1 · Titled Tue 18th Oct Early · 2022-10-18
GM Jose Carlos Ibarra Jerez (2556) – GM Magnus Carlsen (2856) 0-1 · Titled Tue 11th Oct Early · 2022-10-11
IM Alexander Katz (2448) – GM Magnus Carlsen (2856) 0-1 · Titled Tue 11th Oct Early · 2022-10-11
IM Renato Terry (2516) – GM Hikaru Nakamura (2768) 0-1 · Titled Tue 18th Oct Early · 2022-10-18

Search all games of the Borg Defense and its sub-variations

Highest-rated Lichess games

Rumple_DarkOne (2612) – July16Q (2648) 0-1 · 2026-09-07 · 180 + 0s
IM yoseph2013 (2809) – Hello_kiitty (2036) 1-0 · 2026-09-03 · 180 + 0s
gunturchess (2294) – FM chessmem (2475) 0-1 · 2026-09-04 · 180 + 0s

Comes from

King's Pawn Game (1. e4) 1. e4

Continuations

Borg Defense: Borg Gambit (2. d4 Bg7) B00 · 1. e4 g5 2. d4 Bg7
Borg Defense: Zilbermints Gambit B00 · 1. e4 g5 2. d4 e5
Borg Defense: Troon Gambit B00 · 1. e4 g5 2. d4 h6 3. h4 g4

More Borg Defense lines (all)

Borg Defense: Borg Gambit (1. d4 g5) A40

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.