MESON Chess Problem Database

Problem Display
PID: 240448 (8/rPP4Q/k7/2K5/8/1p6/8/8 w - - 0 1)

Parkhomenko, Nikolai A

Problemas, 1977

8/rPP4Q/k7/2K5/8/1p6/8/8

#2

4 + 3

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.bxa8Q#
  • Tries
    • 1.Qd3+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Kxb7!
    • 1.Qh1?
      • 1...Ka5
        • 2.Qa1#
      • 1...Rxb7
        • 2.Qa1#
      • 1...Ra8
        • 2.bxa8Q#
        • 2.bxa8R#
      • 1...b2!
    • 1.Qh8?
      • 1...Ka5
        • 2.Qa1#
      • 1...Kxb7
        • 2.c8Q#
      • 1...Rxb7
        • 2.Qa1#
      • 1...Ra8
        • 2.Qxa8#
        • 2.bxa8Q#
      • 1...b2!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qb5#
      • 1...Ka5
        • 2.Qb5#
      • 1...Kxb7
        • 2.c8Q#
      • 1...Rxb7
        • 2.Qa4#
      • 1...Ra8
        • 2.bxa8Q#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);OGATE::PXR(c)=Q
  • Tries
    • Try
      • Q(D);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(D)
      • Refutation
        • K(b);S_FLIGHT,XP(B)
    • Try
      • Q(D);
      • Vars
        • K(b);P-FLIGHT::QAR(D)
        • R(c);SBLOCK,XP(B)::QAR(D)
        • R(c);OGATE::PXR(c)=Q
      • Refutation
        • P(a);
    • Try
      • Q(D);
      • Vars
        • K(b);P-FLIGHT::QAR(D)
        • K(b);S_FLIGHT,XP(B)::P=Q
        • R(c);SBLOCK,XP(B)::QAR(D)
      • Refutation
        • P(a);
  • Actual
    • Q(D);
    • Threat
      • QAB1(D)
    • Vars
      • K(b);P-FLIGHT::QAR1(D)
      • K(b);S_FLIGHT,XP(B)::P=Q
      • R(c);SBLOCK,XP(B)::QAR2(D)
      • R(c);OGATE::PXR(c)=Q
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