MESON Chess Problem Database

Problem Display
PID: 71419 (B7/2Q2r2/1P6/K1N3r1/1pk2bbR/1NP4n/PR1PP3/2n5 w - - 0 1)

Caine, Walter Edmund

Chess, 1951

B7/2Q2r2/1P6/K1N3r1/1pk2bbR/1NP4n/PR1PP3/2n5

#2

12 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc5+
      • 2.Qxc5#
    • 1...Be5
      • 2.Qxf7#
    • 1...Bf5
      • 2.Sd7#
    • 1...Sxb3+
      • 2.axb3#
    • 1...Sd3
      • 2.exd3#
  • Tries
    • 1.Qxf7+?
      • 1...Rd5
        • 2.Bxd5#
        • 2.Qxd5#
      • 1...Be6!
  • Keys
    • 1.Rc2!
      • threat
        • 2.cxb4#
      • 1...Rxc5+
        • 2.Qxc5#
      • 1...Sxb3+
        • 2.axb3#
      • 1...Bxd2
        • 2.Sxd2#
      • 1...Sxa2
        • 2.d3#
      • 1...Sxe2
        • 2.d3#
      • 1...bxc3
        • 2.Rxc3#
      • 1...Be5
        • 2.Qxf7#
      • 1...Bf5
        • 2.Sd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(g);CHECK,OGATE,P_SPINR(g),XS(I)::QAR1(K),XR(g)
    • B(e);N_PINS(I),P_SPINB(f),S_CUTR(g)::QAB(K),XR(h)
    • B(f);N_PINS(I),P_SPINB(e)::QAR(K)+S(I)
    • S(a);CHECK,OGATE,XS(E)::P(A),XS(a)
    • S(a);OGATE::P(D),XS(a)
  • Tries
    • Try
      • Q(K);CHECK,XR(h)
      • Refutation
        • B(f);P_SPINB(e)
  • Actual
    • R(B);
    • Threat
      • R(B)+P(F),XP(c)
    • Vars
      • R(g);CHECK,OGATE,P_SPINR(g),XS(I)::QAR1(K),XR(g)
      • S(a);CHECK,OGATE,XS(E)::P(A),XS(a)
      • B(e);P_SPINB(f),XP(C)::S(E),XB(e)
      • S(a);N_GUARD,XP(A)::P(C)
      • S(a);N_GUARD,XP(D)::P(C)
      • P(c);OGATE,P_SPINP(c),XP(F)::R1(B),XP(c)
      • B(e);N_PINS(I),P_SPINB(f),S_CUTR(g)::QAB(K),XR(h)
      • B(f);N_PINS(I),P_SPINB(e)::QAR(K)+S(I)
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