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Sissa. Variant on 9 by 9 board with Sissa's. (9x9, Cells: 81) [All Comments] [Add Comment or Rating]In second drawing above, Sissa at c3 captures Queen at e7 by its 'modified Nightrider route' c3-d4-e5-e6-e7. The other pathway c3-c4-c5-e6-d7 is blocked by Rook at c5, but for two-fold-pathway square, one path is sufficient to complete move (and capture). Sissa goes to N-Rider squares by two-fold way, and Rook squares by four-fold way. Also making same distinction is the angled change of direction. When it turns 45 degrees, Sissa goes to N-Rider square; when 135 degrees, Rook square. It is not necessary, as in article, to think in terms of 225- or 315-degree changes of direction--a '315 turn' is just a 45-degree one the other way for Chess purposes.