MESON Chess Problem Database

Problem Display
PID: 153272 (4k1K1/QNr3p1/2P5/8/8/8/8/8 w - - 0 1)

Lincoln, Robert A

StrateGems, 2012

4k1K1/QNr3p1/2P5/8/8/8/8/8

#2

4 + 3

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Qb8#
      • 2.Qa8#
    • 1...Rc8
      • 2.Qe3#
  • Tries
    • 1.Qd4?
      • threat
        • 2.Qd8#
      • 1...Ke7
        • 2.Qe5#
      • 1...Rd7
        • 2.Qxd7#
      • 1...Rc8
        • 2.Qe3#
        • 2.Qe5#
        • 2.Qe4#
        • 2.Qd7#
      • 1...Rxb7!
    • 1.Qb8+?
      • 1...Rc8
        • 2.Qe5#
      • 1...Ke7!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qf8#
      • 1...Ke7
        • 2.Qf7#
      • 1...Rxc6
        • 2.Qf7#
      • 1...Rf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD::QAR(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • QAR1(B)
      • Vars
        • K(c);P-FLIGHT::QAR2(B)
        • R(a);N_GUARD::QAB1(B),XR(a)
      • Refutation
        • R(a);XS(C)
    • Try
      • Q(B);CHECK
      • Vars
        • R(a);OGATE,P_SPINR(a)::QAR(B)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(B);
    • Threat
      • QAR1(B)
    • Vars
      • K(c);P-FLIGHT::QAR1(B)
      • R(a);N_GUARD,XP(A)::QAB1(B)
      • R(a);N_GUARD::QAB1(B),XR(a)
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