MESON Chess Problem Database

Problem Display
PID: 98571 (8/8/8/8/4Q1pN/6kr/6BN/4K3 w - - 0 1)

Pypa, Volodimir Iosifovich

Problem Observer, 1977

8/8/8/8/4Q1pN/6kr/6BN/4K3

#2

5 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxh4
      • 2.Qxg4#
    • 1...Rxh2
      • 2.Sf5#
    • 1...Rxh4
      • 2.Sf1#
  • Tries
    • 1.Kf1?
      • 1...Kxh4
        • 2.Qxg4#
      • 1...Rxh2
        • 2.Sf5#
      • 1...Rxh4
        • 2.Qe5#
      • 1...Kxh2!
    • 1.Ke2?
      • 1...Kxh4
        • 2.Qxg4#
      • 1...Rxh2
        • 2.Sf5#
      • 1...Rxh4
        • 2.Sf1#
      • 1...Kxh2!
    • 1.Bxh3?
      • 1...Kxh2
        • 2.Qg2#
      • 1...Kxh4
        • 2.Qxg4#
      • 1...gxh3
        • 2.Sf1#
      • 1...Kxh3!
    • 1.Qf4+?
      • 1...Kxh4
        • 2.Qxg4#
      • 1...Kxf4!
  • Keys
    • 1.Bf1!
      • 1...Kxh2
        • 2.Qg2#
      • 1...Kxh4
        • 2.Qxg4#
      • 1...Rxh2
        • 2.Sf5#
      • 1...Rxh4
        • 2.Qe5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P_SPINP(c),S_FLIGHT,XS(E)::QAR1(D),XP(c)
    • R(b);SBLOCK,XS(C)::S(E)
    • R(b);SBLOCK,XS(E)::S(C)
  • Tries
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P_SPINP(c),S_FLIGHT,XS(E)::QAR1(D),XP(c)
        • R(b);SBLOCK,XS(C)::S(E)
        • R(b);SBLOCK,XS(E)::QAB(D)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • K(A);P-FLIGHT
      • Vars
        • K(a);P_SPINP(c),S_FLIGHT,XS(E)::QAR1(D),XP(c)
        • R(b);P_PINB(B),SBLOCK,XS(C)::S(E)
        • R(b);SBLOCK,XS(E)::S(C)
      • Refutation
        • K(a);S_FLIGHT,XS(C)
    • Try
      • B(B);XR(b)
      • Vars
        • K(a);S_FLIGHT,XS(C)::QAR1(D)
        • K(a);P_SPINP(c),S_FLIGHT,XS(E)::QAR1(D),XP(c)
        • P(c);SBLOCK,XB(B)::S(C)
      • Refutation
        • K(a);P-FLIGHT,XB(B)
    • Try
      • Q(D);CHECK
      • Vars
        • K(a);P_SPINP(c),S_FLIGHT,XS(E)::QAR1(D),XP(c)
      • Refutation
        • K(a);S_FLIGHT,XQ(D)
  • Actual
    • B(B);
    • Vars
      • K(a);S_FLIGHT,XS(C)::QAR1(D)
      • K(a);P_SPINP(c),S_FLIGHT,XS(E)::QAR1(D),XP(c)
      • R(b);SBLOCK,XS(C)::S(E)
      • R(b);SBLOCK,XS(E)::QAB(D)
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