MESON Chess Problem Database

Problem Display
PID: 234660 (K7/1Q2P3/8/k7/3rN3/1P6/8/8 w - - 0 1)

Lincoln, Robert A

Kudesnik, 2008

K7/1Q2P3/8/k7/3rN3/1P6/8/8

#2

5 + 2

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd8+
      • 2.exd8Q#
      • 2.exd8B#
  • Tries
    • 1.Sd6?
      • threat
        • 2.Qb5#
      • 1...Rb4
        • 2.Qa7#
      • 1...Rd5
        • 2.Sc4#
      • 1...Rxd6!
    • 1.Qa6+?
      • 1...Kb4
        • 2.Qa4#
      • 1...Kxa6!
    • 1.Qa7+?
      • 1...Kb4
        • 2.Qa4#
      • 1...Kb5!
    • 1.e8Q?
      • threat
        • 2.Qeb5#
        • 2.Qbb5#
      • 1...Rd8+
        • 2.Qxd8#
      • 1...Rb4
        • 2.Qa7#
      • 1...Rd5
        • 2.Qa4#
        • 2.b4#
      • 1...Rd7!
  • Keys
    • 1.Sc3!
      • threat
        • 2.Qb5#
      • 1...Rd8+
        • 2.exd8Q#
        • 2.exd8B#
      • 1...Rb4
        • 2.Qa7#
      • 1...Rd5
        • 2.b4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • R(a);CHECK,OGATE::PXR(a)=Q
  • Tries
    • Try
      • S(B);
      • Threat
        • QAR1(C)
      • Vars
        • R(a);SBLOCK::QAR2(C)
        • R(a);N_GUARD::S(B)
      • Refutation
        • R(a);XS(B)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT,XQ(C)
    • Try
      • Q(C);CHECK
      • Vars
        • K(b);OGATE,S_FLIGHT::QAR1(C)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • P(D);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);CHECK,N_GUARD::QAB(D),XR(a)
        • R(a);SBLOCK::QAR2(C)
      • Refutation
        • R(a);
  • Actual
    • S(B);
    • Threat
      • QAR1(C)
    • Vars
      • R(a);CHECK,OGATE::PXR(a)=Q
      • R(a);SBLOCK::QAR2(C)
      • R(a);N_GUARD::P(A)
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