CAISSA RESEARCH
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Opening repertoire holes · brianhliou

Generated 2026-05-03 07:27 UTC · 2643 losses (2629 analysed) · 2061 first-deviations found · 24 clusters surfaced
Each row = the same exact position (FEN-keyed) reached in losses where you played the same move at least twice. The arrow on the board shows the engine's preferred move. Clusters ranked by recurrence (then average drop): how often you fall into the same hole matters more than how badly any single instance hurt. Drops shown in pawn units (Δ1.00 ≈ losing a full pawn of equity); lichess judgments are shown as colored badges. 
r n . q k b n r
p p . . p p p p
. . p . . . . .
. . . p P b . .
. . . P . . . .
. . . B . . . .
P P P . . P P P
R N B Q K . N R
#1 · ply 7 · 7× repeated
Caro-Kann Defense: Advance Variation B12
you played: e6 → engine: Bxd3
recurrences: 7 avg drop: Δ1.07 max drop: Δ1.13
raw_cp ×7
examples: OvxaHugG9snH29lHp09mcXY5 
r n b q k b n r
p p p p . p p p
. . . . . . . .
. . . . . . . .
. . . p P . . .
. . P . . . . .
P P . . . P P P
R N B Q K B N R
#2 · ply 5 · 5× repeated
Danish Gambit C21
you played: d3 → engine: dxc3
recurrences: 5 avg drop: Δ1.11 max drop: Δ1.11
raw_cp ×5
examples: Cd5eBmsoRVJirBHqHBNf4PP1 
r n b q k b . r
p p . p p p p p
. . . . . n . .
. . . . . . . .
. . . p . B . .
. . . . . N . .
P P P . P P P P
R N . Q K B . R
#3 · ply 6 · 3× repeated
Indian Defense: Accelerated London System A45
you played: Nxd4 → engine: Qxd4
recurrences: 3 avg drop: Δ3.17 max drop: Δ3.17
raw_cp ×3
examples: VE9mGugRU1FnstCuKm5uJ5G4 
r . b . k b n r
p p . . p p p p
. q n . . . . .
. . p p . . . .
. . . P . B . .
. . . . P N . .
P P P . . P P P
R N . Q K B . R
#4 · ply 8 · 3× repeated
Queen's Pawn Game: Accelerated London System, Steinitz Countergambit D00
you played: b3 → engine: Nc3
recurrences: 3 avg drop: Δ1.95 max drop: Δ2.66
raw_cp ×2blunder
examples: slmmFMkP5Qjf13UdzdZ5Ss7t 
r n . . k b n r
p p . . p p p .
. q p . . . . .
. . . p P . B p
. . . P . . . P
. . . Q . . . .
P P P . . P P .
R N . . K . N R
#5 · ply 13 · 3× repeated
Caro-Kann Defense: Advance Variation, Tal Variation B12
you played: Qxb2 → engine: Qa6
recurrences: 3 avg drop: Δ1.27 max drop: Δ1.34
mistake ×2raw_cp
examples: DTAOcOoCKVphNLIBsSNL0QDW 
r n . q k b n r
p p . . p p p .
. . p . P . b p
. . . p . . . .
. . . P . . P P
. . . . . . . .
P P P . . P . .
R N B Q K B N R
#6 · ply 11 · 3× repeated
Caro-Kann Defense: Advance Variation, Bayonet Attack B12
you played: fxe6 → engine: Qd6
recurrences: 3 avg drop: Δ1.22 max drop: Δ1.22
raw_cp ×3
examples: U1ZDfgX6joUDqODukqJ2aqTI 
r n b q k b n r
p p p p . p p p
. . . . . . . .
. . . . p . . .
. . . P . . . .
. . . . . . . .
P P P . P P P P
R N B Q K B N R
#7 · ply 2 · 2× repeated
Englund Gambit A40
you played: Bf4 → engine: dxe5
recurrences: 2 avg drop: Δ5.84 max drop: Δ6.07
raw_cp ×2
examples: DMO3Ul8h4mFgMb08 
r . . q k . . r
p p p . . p . .
. . n p . n . .
. . b P p . B .
. . B . . . . .
. . . P . . . .
P P P . . P P P
R . . Q K . . R
#8 · ply 21 · 2× repeated
Italian Game: Giuoco Pianissimo, Canal Variation C50
you played: Nd4 → engine: Rg8
recurrences: 2 avg drop: Δ2.31 max drop: Δ2.38
raw_cpblunder
examples: RqkuJz8HbKFUSH6W 
r . b q . b . r
p p . n k . p .
. . p . p n B p
. . . . . . . .
. . . P . . . .
. . . . . N . .
P P P . . P P P
R . B Q . R K .
#9 · ply 19 · 2× repeated
Caro-Kann Defense: Karpov Variation B17
you played: Nb6 → engine: Qc7
recurrences: 2 avg drop: Δ2.25 max drop: Δ2.39
raw_cp ×2
examples: GQI3VdfM5LLLp8Jj 
r . b q k . n r
. p p . . p p p
p . p b . . . .
. . . . . . . .
. . . Q P . . .
. . . . . N . .
P P P . . P P P
R N B . . R K .
#10 · ply 13 · 2× repeated
Ruy Lopez: Exchange Variation, King's Bishop Variation C69
you played: Bf8 → engine: f6
recurrences: 2 avg drop: Δ1.55 max drop: Δ1.55
raw_cp ×2
examples: d889bykNvVYuyrFE 
r . . q k . . r
p p . . n p p p
. . n b p . . .
. . . p . . . .
. . . P . . b .
. . P B . N . .
P P . N . P P P
R . B Q R . K .
#11 · ply 17 · 2× repeated
Caro-Kann Defense B10
you played: O-O → engine: Bf5
recurrences: 2 avg drop: Δ1.52 max drop: Δ1.54
mistakeraw_cp
examples: uhbkkkI3ePdnaG0k 
r n b q k b n r
p p . p p p p p
. . . . . . . .
. . p . . . . .
. . . P . . . .
. . . . . . . .
P P P . P P P P
R N B Q K B N R
#12 · ply 2 · 2× repeated
Benoni Defense: Old Benoni A43
you played: Bf4 → engine: d5
recurrences: 2 avg drop: Δ1.50 max drop: Δ1.58
raw_cp ×2
examples: f1EXKNdX8ki4ZFGF 
r n b q k b . r
p p . . p p p p
. . p . . n . .
. . . . . . . .
. . . P P . . .
. . N . . . . .
P P P . . . P P
R . B Q K B N R
#13 · ply 9 · 2× repeated
Blackmar-Diemer Gambit Declined: O'Kelly Defense D00
you played: Bg4 → engine: e5
recurrences: 2 avg drop: Δ1.39 max drop: Δ1.62
mistakeraw_cp
examples: 9Sb2lsoxh4PjQxas 
r . . . k . . r
p p . n b p p p
. q p . p n . .
. . . p N b . .
. . . P . B . .
. Q P . P . . .
P P . N B P P P
R . . . K . . R
#14 · ply 17 · 2× repeated
Queen's Pawn Game: Accelerated London System D00
you played: O-O → engine: h5
recurrences: 2 avg drop: Δ1.39 max drop: Δ1.41
raw_cp ×2
examples: FgWpApEn8nYEV1ok 
r . b q k b . r
p p . . . . p p
. . n . p p . .
. . . p . . B n
. . . P . . . .
. . P B . N . .
P P . . . P P P
R N . Q K . . R
#15 · ply 16 · 2× repeated
Queen's Pawn Game: London System D02
you played: Bh4 → engine: Be3
recurrences: 2 avg drop: Δ1.19 max drop: Δ1.35
raw_cpinaccuracy
examples: NyNL2wBcu9ukpvAB 
r n b q . r k .
p p p p p p b p
. . . . . n p .
. . . . . . . .
. . . P P B . .
. . N . . . . .
P P P . . P P P
R . . Q K B N R
#16 · ply 8 · 2× repeated
Indian Defense: Accelerated London System A45
you played: f3 → engine: e5
recurrences: 2 avg drop: Δ1.17 max drop: Δ1.19
mistakeraw_cp
examples: VHsMRCROXJ5xwGAt 
r n b q k b . r
p p . . p p p p
. . p . . n . .
. . . p . . . .
. . P P . B . .
. . N . . . . .
P P . . P P P P
R . . Q K B N R
#17 · ply 7 · 2× repeated
Slav Defense D10
you played: a6 → engine: dxc4
recurrences: 2 avg drop: Δ1.15 max drop: Δ1.17
raw_cp ×2
examples: 8QViLKfFCKxjq2se 
r n b q . r k .
p p . . b p p p
. . . p . n . .
. . p P p . . .
. . . . P . . .
. . N . . . P .
P P P . . P B P
R . B Q K . N R
#18 · ply 12 · 2× repeated
Benoni Defense: Old Benoni A43
you played: Nf3 → engine: a4
recurrences: 2 avg drop: Δ1.14 max drop: Δ1.19
inaccuracymistake
examples: 8Cu9GR9qTHrTH7JW 
r n b q k b n r
p p . . p p p p
. . p . . . . .
. . . . . . . .
. . . P p . . .
. . N . . P . .
P P P . . . P P
R . B Q K B N R
#19 · ply 7 · 2× repeated
Caro-Kann Defense: Rasa-Studier Gambit B15
you played: Nd7 → engine: exf3
recurrences: 2 avg drop: Δ1.13 max drop: Δ1.13
raw_cp ×2
examples: qeDHufplIrpURhNI 
r . b q . r k .
p p p p . p p p
. . n . . n . .
. . b . p . . .
. . B P P . . .
. . P . . N . .
P P . . . P P P
R N B Q . R K .
#20 · ply 11 · 2× repeated
Italian Game: Classical Variation, Albin Gambit C50
you played: exd4 → engine: Bb6
recurrences: 2 avg drop: Δ1.11 max drop: Δ1.11
raw_cp ×2
examples: WMOyQK3yMwLyFCRn 
r . b q k . . r
p p p . . p p p
. . p . . n . .
. . b . N . . .
. . . . P . . .
. . N . . . . .
P P P P . P P P
R . B Q K . . R
#21 · ply 11 · 2× repeated
Four Knights Game: Spanish Variation, Classical Variation C48
you played: Qd4 → engine: Bxf2+
recurrences: 2 avg drop: Δ1.10 max drop: Δ1.12
inaccuracyraw_cp
examples: buxsyBbUV8ZfsevE 
r . b . k . . r
p p . . p p b p
. n n q . . p .
. . . P . . . .
. . . . . . . .
. B . . . N . .
P P . . . P P P
R N B Q . R K .
#22 · ply 21 · 2× repeated
Sicilian Defense: Hyperaccelerated Dragon B27
you played: Ne5 → engine: Na5
recurrences: 2 avg drop: Δ1.10 max drop: Δ1.10
inaccuracyraw_cp
examples: CEXv1VPRTc3PgEDA 
r n . q k b . r
p p . . p p p p
. . p . . n . .
. . . p . b . .
. . P P . . . .
. Q N . . N . .
P P . . P P P P
R . B . K B . R
#23 · ply 9 · 2× repeated
Slav Defense: Three Knights Variation D15
you played: b6 → engine: Qb6
recurrences: 2 avg drop: Δ1.02 max drop: Δ1.02
raw_cp ×2
examples: IbccbOMEaWAXkI2V 
r . b q k b n r
p p . . p p p p
. . n . . . . .
. . . p . . . .
. . . P . . . .
. . N . . P . .
P P . . P . P P
R . B Q K B N R
#24 · ply 9 · 2× repeated
Slav Defense: Exchange Variation D10
you played: Nf6 → engine: e5
recurrences: 2 avg drop: Δ1.00 max drop: Δ1.00
raw_cp ×2
examples: EjzzkbPfpXvT3ILS
Caissa Research · M3 repertoire-hole report · clusters by (position_key, san_played) over user-color losses with eval data