MESON Chess Problem Database

Problem Display
PID: 158608 (1r2R1B1/NPp1p2K/1BPkP2N/6R1/1b1Ppn2/4q2p/b7/8 w - - 0 1)

McWilliam, Robert C

Bournemouth Evening Echo, 1985

(First published on Tue Aug 27 1985)

1r2R1B1/NPp1p2K/1BPkP2N/6R1/1b1Ppn2/4q2p/b7/8

#2

11 + 10

15393 McWilliam Scrapbook 2016
5454 Near Snap 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb7
      • 2.Rd8#
    • 1...Rc8
      • 2.bxc8S#
    • 1...Rd8
      • 2.Rxd8#
    • 1...Bd5
      • 2.Sf5#
    • 1...Be1
      • 2.Bc5#
    • 1...Bd2
      • 2.Bc5#
    • 1...Bc3
      • 2.Bc5#
    • 1...Ba5
      • 2.Bc5#
    • 1...Bc5
      • 2.Bxc5#
    • 1...Sd5
      • 2.Sf5#
    • 1...Sxe6
      • 2.Sf7#
  • Tries
    • 1.Rc5?
      • threat
        • 2.Sf5#
        • 2.Sb5#
      • 1...Bxe6
        • 2.Sb5#
      • 1...cxb6
        • 2.Sb5#
      • 1...Qe2
        • 2.Sf5#
      • 1...Qd3
        • 2.Sf5#
      • 1...Bc4
        • 2.Sf5#
      • 1...Bxc5!
    • 1.Rd5+?
      • 1...Bxd5
        • 2.Sf5#
      • 1...Sxd5
        • 2.Sf5#
      • 1...Kxd5!
  • Keys
    • 1.Rc8!
      • threat
        • 2.Bxc7#
      • 1...Rxb7
        • 2.Rd8#
      • 1...Rxc8
        • 2.bxc8S#
      • 1...Sxe6
        • 2.Sf7#
      • 1...cxb6
        • 2.Sb5#
      • 1...Ba5
        • 2.Bc5#
      • 1...Sd5
        • 2.Sf5#

Anticipated by 170152(1982)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 6
  • Sets
    • R(j);N_GUARD,XP(H)::R(J)
    • R(j);OGATE::PXR(j)=S
    • R(j);N_GUARD::R(J),XR(j)
    • B(a);SBLOCK::S(F)
    • B(d);N_GUARD::B(C)
    • B(d);N_GUARD::B(C),XB(d)
    • S(f);SBLOCK::S(F)
    • S(f);SBLOCK,XP(E)::S(F)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • B(a);XP(E)::S(G)
        • P(h);XB(C)::S(G)
        • Q(b);::S(F)
        • B(a);::S(F)
      • Refutation
        • B(d);XR(B)
    • Try
      • R(B);CHECK
      • Vars
        • B(a);SBLOCK,XR(B)::S(F)
        • S(f);SBLOCK,XR(B)::S(F)
      • Refutation
        • K(g);P-FLIGHT,XR(B)
  • Actual
    • R(J);
    • Threat
      • B(C),XP(h)
    • Vars
      • R(j);N_GUARD,XP(H)::R(J)
      • R(j);OGATE,XR(J)::PXR(j)=S
      • S(f);SBLOCK,XP(E)::S(F)
      • P(h);XB(C)::S(G)
      • B(d);N_GUARD::B(C)
      • S(f);SBLOCK::S(F)
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