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George Duke wrote on 2008-01-16 UTC
RN215 British Bulldog. Capture is by tackling. [See Winther's Bifurcation pieces for relatedness.] (a) no effect (b) When tackling, the victim is taken in normal move of the piece by replacement, but the tackler's momentum carries on systematically. Rook, Bishop, Queen tackle-capturing end up forward of the target square one step 45 degrees offset. (Rook at c1 takes c4 and Rook's arrival square becomes d5 or b5 at option.) Knight tackles to Falcon squares, Falcon to Scorpion squares. No King or Pawn tackling. If no arrival square is available those ways beyond the victim, tackle (and capture) is illegal. (c) 'b', Pawns tackle like RBQ one step 45 degrees forwardly only (two spaces altogether from Pawn departure square). (d) 'b', Kings tackle by direct one-step counter the victim's position. (King e2-d3 takes either e3 or d2, or both.) (e) 'd', No King double capturing means choice of victim. (f) c,d (g) c,e (h) d,e (i) 'c', En passant tackling to the logical forward one-step 45-degree-angled (j) c,d,i (k) c,e,i (l) 'b', Knights alone may double tackle-capture (Nightrider-like), useful on 10x10 empowering Knight. (m) c,l (n) c,d,e,l (o) b, no tackling on the adjacent square (p) b,d, no tackling on the adjacent square except that performed by King (q) b, If a protected piece is tackle-captured, the protector (player and piece) immediately may 'untackle'. To untackle means moving onto the square just vacated by the captured piece normally, and ending in a legal tackle position just beyond; finally in third step, the just-captured piece reappears on its selfsame square. (r) q, untackling permitted up to two following turns (s) c, q (t) d,q (u) c,d,q (v) c, d, e, q (w) d, r (x) c,d,r (y) c,d,e,r (z) d,o,q (aa) c,d,i,q (bb) c,d,e,i,q (cc) d,i,r (dd) c,d,i,r (ee) c,d,e,i,r (ff) d,i,r (gg) d,q,l (hh) c,d,l,q (ii) c,d,e,l,q (jj) d,l,r (kk)c,d,l,r (ll) c,d,e,l,r (mm) d,i,l,q (nn) c,d,e,i,l,q (oo) d,i,l,r (pp) c,d,l,r (qq) d,i,l,r (rr) d,o,q (ss) c,d,e,o,q (tt) d,o,r (uu) d,e,o,r (vv) d,i,o,r (ww) d,i,o,r. Cumulative: 2.07580956 x 10^45 separately-playable Chess Rules-sets, now within four or five orders of magnitude how many atoms exist throughout planet Earth.

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