MESON Chess Problem Database

Problem Display
PID: 492 (2B5/2p4K/p1PQ4/r4N1R/p1p1k2P/4P2R/rb6/1bN5 w - - 0 1)

Clark, Cecil Henry Douglas

The Observer, 1957

2B5/2p4K/p1PQ4/r4N1R/p1p1k2P/4P2R/rb6/1bN5

#2

10 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Qf4#
    • 1...Rxf5
      • 2.Bxf5#
    • 1...Bxc1
      • 2.Qd4#
    • 1...Ba3
      • 2.Qd4#
    • 1...Bd4
      • 2.Qxd4#
    • 1...c3
      • 2.Qd4#
    • 1...cxd6
      • 2.Sxd6#
  • Tries
    • 1.Rg5?
      • threat
        • 2.Rg4#
      • 1...Rxf5
        • 2.Bxf5#
      • 1...cxd6
        • 2.Sxd6#
      • 1...Be5!
  • Keys
    • 1.Qg6!
      • threat
        • 2.Sd6#
      • 1...Kd5
        • 2.Se7#
      • 1...Ke5
        • 2.Qe6#
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Re5
        • 2.Qg2#
      • 1...Be5
        • 2.Se7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 6
  • Sets
    • R(g);SBLOCK::QAR1(H)
    • R(g);OGATE,XS(E)::B(J),XR(g)
    • B(c);N_GUARD,XS(A)::QAR1(H)
    • B(c);N_GUARD::QAR1(H)
    • B(c);N_GUARD::QAR1(H),XB(c)
    • P(e);S_CUTB(c)::QAR1(H)
    • P(i);XQ(H)::S(E),XP(i)
  • Tries
    • Try
      • R(F);
      • Threat
        • R(F)
      • Vars
        • R(g);OGATE,XS(E)::B(J),XR(g)
        • P(i);XQ(H)::S(E),XP(i)
      • Refutation
        • B(c);
  • Actual
    • Q(H);
    • Threat
      • QAB(H)+S(E),DCHECK
    • Vars
      • K(f);S_FLIGHT::R(F)+S(E),DCHECK
      • K(f);P-FLIGHT::QAR1(H)
      • R(g);OGATE,P_SPINR(g),XS(E)::QAB1(H),XR(g)
      • R(g);SBLOCK::QAB(H)
      • B(c);S_CUTR(g)::QAB(H)+S(E)
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