MESON Chess Problem Database

Problem Display
PID: 18481 (4r3/3b1Q2/7b/1N6/r3k3/2Rp2B1/2n4K/5N2 w - - 0 1)

Quack, Godfrey C

Chess, 1956

4r3/3b1Q2/7b/1N6/r3k3/2Rp2B1/2n4K/5N2

#2

6 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Bf5
      • 2.Qb7#
    • 1...Se3
      • 2.Sd2#
    • 1...Sb4
      • 2.Rc4#
    • 1...Sd4
      • 2.Sd6#
    • 1...d2
      • 2.Qf3#
  • Tries
    • 1.Sd2+?
      • 1...Ke3
        • 2.Qf2#
      • 1...Bxd2!
    • 1.Rc4+?
      • 1...Sd4
        • 2.Sc3#
        • 2.Sd6#
      • 1...Rxc4!
    • 1.Qf4+?
      • 1...Kd5
        • 2.Sc7#
      • 1...Bxf4!
  • Keys
    • 1.Rc5!
      • threat
        • 2.Qd5#
      • 1...Rd4
        • 2.Sc3#
      • 1...Re5
        • 2.Rxe5#
      • 1...Re6
        • 2.Qf5#
      • 1...Bc6
        • 2.Qf5#
      • 1...Be6
        • 2.Re5#
      • 1...Se3
        • 2.Sd2#
      • 1...Sb4
        • 2.Rc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 3
  • Sets
    • B(f);OGATE,SBLOCK::QAB(F)
    • S(a);SBLOCK,S_CUTB(e)::S(A)
    • S(a);N_GUARD,S_CUTR(c)::R(C)
    • S(a);SBLOCK::S(E)
    • P(b);::QAB1(F)
  • Tries
    • Try
      • S(A);CHECK
      • Vars
        • K(d);P-FLIGHT,P_SPINP(b)::QAB1(F)
      • Refutation
        • B(e);XS(A)
    • Try
      • R(C);CHECK
      • Refutation
        • R(c);XR(C)
    • Try
      • Q(F);CHECK
      • Vars
        • K(d);S_FLIGHT::S(E)
      • Refutation
        • B(e);P_PINB(D),XQ(F)
  • Actual
    • R(C);
    • Threat
      • QAB1(F)
    • Vars
      • R(c);SBLOCK::S(E)
      • R(g);N_GUARD::R1(C),XR(g)
      • R(g);S_CUTB(f)::QAB1(F)
      • B(f);N_GUARD::QAB1(F)
      • B(f);S_CUTR(g)::R1(C)
      • S(a);SBLOCK,S_CUTB(e)::S(A)
      • S(a);N_GUARD,S_CUTR(c)::R(C)
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