MESON Chess Problem Database

Problem Display
PID: 77517 (K7/8/2P5/2p5/kNQ5/8/2P5/8 w - - 0 1)

Cyrulik, Stepan Pavlovich

Problemist Pribuzhya, 1996

K7/8/2P5/2p5/kNQ5/8/2P5/8

#2

5 + 2

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ka3
      • 2.Qb3#
    • 1...cxb4
      • 2.Qa6#
  • Tries
    • 1.Ka7?
      • 1...Ka3
        • 2.Qb3#
      • 1...cxb4
        • 2.Qa6#
      • 1...Ka5!
    • 1.Kb7?
      • 1...Ka3
        • 2.Qb3#
      • 1...cxb4
        • 2.Qa6#
      • 1...Ka5!
    • 1.Kb8?
      • 1...Ka3
        • 2.Qb3#
      • 1...cxb4
        • 2.Qa6#
      • 1...Ka5!
    • 1.Sa2+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5!
    • 1.Sd3+?
      • 1...Ka3
        • 2.Qb3#
        • 2.Qa6#
      • 1...Ka5!
    • 1.Sd5+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5!
    • 1.Sa6+?
      • 1...Ka3
        • 2.Qb3#
      • 1...Ka5!
    • 1.c7?
      • 1...Ka3
        • 2.Qb3#
      • 1...cxb4
        • 2.Qa6#
      • 1...Ka5!
  • Keys
    • 1.c3!
      • 1...Ka3
        • 2.Qa2#
      • 1...Ka5
        • 2.Qa6#
      • 1...cxb4
        • 2.Qxb4#

Anticipated by 18562(1956), 110147(1987)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(a);P-FLIGHT::QAR1(C)
    • P(b);P_SPINP(b),SBLOCK,XS(B)::QAR2(C)
  • Tries
    • Try
      • K(E);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • P(b);P_SPINP(b),SBLOCK,XS(B)::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(E);S_FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • P(b);P_SPINP(b),SBLOCK,XS(B)::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • K(E);P-FLIGHT
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • P(b);P_SPINP(b),SBLOCK,XS(B)::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);CHECK
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • S(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • P(D);
      • Vars
        • K(a);P-FLIGHT::QAR1(C)
        • P(b);P_SPINP(b),SBLOCK,XS(B)::QAR2(C)
      • Refutation
        • K(a);P-FLIGHT
  • Actual
    • P(A);
    • Vars
      • K(a);P-FLIGHT::QAR1(C)
      • P(b);OGATE,P_SPINP(b),XS(B)::QAR1(C),XP(b)
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