Chess Terms Beginning with 'O'

O'Kelly Variation
O'Neill Gambit
O'Neill Gambit Accepted
O'Neill Gambit Accepted, Lila Attack
O'Neill Gambit Accepted, Main Line
O'Neill Gambit Accepted, Main Line, 3. Nc3
Observer
Octo-Knight
Odds
odds chess
odds game
Offbeat
Old
Old Benoni
Old Benoni Defense
Old Benoni Defense Benoni Indian Defense
Old Benoni Defense Cormorant Gambit
Old Benoni Defense Franco Benoni Defense
Old Benoni Defense Mujannah Benoni Staunton Gambit
Old Benoni Defense Mujannah Formation
Old Benoni Defense Schlenker Defense
Old Benoni Defense Schmid Variation
Old Benoni Defense Semi Benoni Variation Blockade Variation
Old Benoni Defense Zilbermints Benoni Gambit
Old Benoni: 2.c3
Old Benoni: 2.d5 b5
Old Benoni: 2.d5 e6
Old Benoni: 2.d5 e6 3.c4
Old Benoni: 2.d5 Nf6 3.Nc3
Old Benoni: 2.e3
Old Benoni: Clarendon Court, 3.c4
Old Benoni: Clarendon Court, 3.Nc3
Old Benoni: Czech, 3.c4 d6
Old Benoni: Czech, 3.c4 d6 4.e4
Old Benoni: Czech, 3.c4 d6 4.e4 Be7
Old Benoni: Czech, 3.e4 d6 4.Bb5+
Old Benoni: Czech, 3.e4 d6 4.Nc3 a6 5.a4 Be7
Old Benoni: Czech, 3.e4 d6 4.Nc3 g6
Old Benoni: Czech, 3.e4 d6 4.Nc3 Nf6
Old Benoni: Schmidt, 3.e4
Old Benoni: Schmidt, 3.e4 Nf6
Old Benoni: Schmidt, 3.Nc3
Old Benoni: Schmidt, 3.Nf3
Old Indian Attack
Old Indian Defence
Old Indian Defense
Old Indian Defense Czech Variation
Old Indian Defense Czech Variation with
Old Indian Defense Duz Khotimirsky Variation
Old Indian Defense Janowski Main Line
Old Indian Defense Janowski Variation
Old Indian Defense Tartakower Indian Variation
Old Indian Defense Ukrainian Two Knights Main Line
Old Indian Defense Ukrainian Two Knights Variation
Old Indian Defense Ukrainian Variation
Old Indian Defense: Czech Variation, with Nc3
Old Indian Defense: Czech Variation, with Nf3
Old Indian Defense: Duz-Khotimirsky Variation
Old Indian Defense: Normal Variation
Old Indian: 3.Nc3
Old Indian: 3.Nc3 Nbd7 4.e4 e5 5.d5
Old Indian: 3.Nc3 Nbd7 4.e4 e5 5.Nge2
Old Indian: 3.Nf3
Old Indian: 3.Nf3 Nbd7
Old Indian: 4.Nf3 exd4
Old Indian: 4.Nf3 Nc6
Old Indian: 5.Bg5
Old Indian: 5.e4 Be7 6.Be2 c6 7.O-O
Old Indian: Main Line, 8.h3
Old Indian: Ukrainian, 4.d5
Old Indian: Ukrainian, Queenswap
Old Sicilian Variation
Old Sicilian Variation (3.Bc4 e6)
Old_Benoni
Online
Only move
Open
Open Catalan
open file
Open Game
Open Game: 2.d3 d5
Open Game: Alapin Opening
Open Game: Gunderam Defence, 3.Nc3
Open Game: Inverted Philidor
Open Game: Inverted Philidor, 4.Be2
Open Game: Portuguese, 2...c6
Open Game: Portuguese, 2...Nf6
Open Games
Open lines
Open Ruy Lopez
Open Ruy López
Open section
Open Sicilian
Open Sicilian with 2...Nc6
Open Spanish
Open tournament
Open_File
Open_Sicilian
Open file
Opening
opening advantage
Opening book
Opening booker
opening books or videos
opening concepts
opening databases
opening development principles
Opening enjoyer
Opening enjoyer deluxe
Opening exploration
Opening explorer
Opening focus plan
Opening grinder
Opening ideas
Opening ideas overview
opening name
Opening names
Opening nerd
Opening novelty
Opening performance
Opening practice plan
Opening prep
opening preparation
Opening Preperation
Opening Principle
opening principles
Opening References
opening repertoire
Opening repertoires
opening study
Opening study plan
Opening term
Opening theoretician
opening theory
opening theory videos
Opening training plan
Opening trap
Opening trap fiend
Opening trapper
opening tree
Opening Variants
Opening-Concepts
Opening-principles
Opening-Repertoire
OpeningPrinciples
openings
Openings Catalog
Openings performance
Opera mate
oposição
Opponents
Opposite
Opposite bishops
Opposite-colored bishop
Opposite-colored Bishop Ending
Opposite-Colored Bishops
Opposite-colored_bishops
opposite-coloured bishops
Opposite-side
Opposite-side castling
Opposite-side_castling
Opposite-Wing Castling
opposition
Orangutan
Orangutan Opening
Orthodox
Orthodox Defense
Orthodox Defense (QGD)
OTB
OTB player
Out of book
Outflanking
outpost
outposts
Outside passed pawn
outside passer
outside-passed-pawn
Over the board
overextended
overextension
overload
overloaded
overloaded piece
overloading
overprotection
oversight
Overworked
Owen Defence
Owen Defence: 2.d4 Bb7
Owen Defence: 3.Bd3
Owen Defence: 3.Bd3 e6
Owen Defence: 3.Bd3 e6 4.Nf3
Owen Defence: 3.Bd3 e6 4.Nf3 c5 5.c3
Owen Defence: 3.Bd3 Nf6
Owen Defence: French
Owen Defense
Owen Defense: Guatemala Defense
Owen Defense: Smith Gambit
Owen's
Owen's Defense
Owen's_Defense
Owen’s Defense
Owens Defense
Owens Defense Smith Gambit
Oxford–Cambridge Varsity Match
Last updated 2025-11-09