He moved to London in 1845. In 1846, he lost a match against visiting master Lionel Kieseritzky, and another against Howard Staunton, losing 15.5-8.5. His best chess result was winning a match against Henry Bird in 1851. He played in the first international chess tournament, London 1851, again beating Bird in the first round, but losing to Staunton in the second and József Szén in the third.
"Horwitz bishops", a configuration in which two bishops are aggressively placed on adjacent diagonals, are named after Horwitz.
- Hooper, David; Whyld, Kenneth (1992), The Oxford Companion to Chess (2nd ed.), Oxford University Press, ISBN 0-19-280049-3
- Jacobs, Joseph; Porter, A. (1901–1906), "Horwitz, Bernard", in Singer, Isidore (ed.), Jewish Encyclopedia, 6, p. 472
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