Showalter won U.S. Championship matches against Max Judd (1891/92, +7-4=3), Albert Hodges (1894, +7-6=4), S. Lipschütz (1895, +7-4=3), Emil Kemény (1896, +7-4=4), and John Finan Barry (1896, +7-2=4).
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The famous "Capablanca Simplifying Manoeuvre" in the Orthodox Variation of the Queen's Gambit Declined (1.d4 d5 2.c4 e6
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