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A23 ECO index

GM Joel’s Chess Week Recap - Episode 139
McShane, Caruana, Aronian, Dreev, Vitiugov, Bluebaum, Wang Hao, Anton, Grischuk, Karjakin
C48, B40, A18, D42, A23, B45
Improve Your Chess: Two Big Blunders Even Out
A23 English: Bremen system, Keres variation