MESON Chess Problem Database

Problem Display
PID: 264429 (8/1Q2BpK1/2P4p/6Pk/6p1/8/6NP/8 w - - 0 1)

Lincoln, Robert A

The Problemist, 1992

8/1Q2BpK1/2P4p/6Pk/6p1/8/6NP/8

#2

7 + 4

SOLUTION

  • SOUND
  • Tries
    • 1.Qc8?
      • 1...hxg5
        • 2.Qh8#
      • 1...g3
        • 2.Qh3#
      • 1...f5
        • 2.Qe8#
      • 1...f6!
    • 1.Qb1?
      • 1...hxg5
        • 2.Qh7#
      • 1...g3
        • 2.Qd1#
      • 1...f6
        • 2.Qg6#
      • 1...f5!
    • 1.Qb3?
      • threat
        • 2.Qxf7#
      • 1...g3
        • 2.Qd1#
        • 2.Qf3#
      • 1...f5
        • 2.Qf7#
      • 1...f6!
  • Keys
    • 1.Qb5!
      • 1...hxg5
        • 2.Qxg5#
      • 1...g3
        • 2.Qe2#
      • 1...f5
        • 2.gxf5 ep#
      • 1...f6
        • 2.gxf6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);
      • Vars
        • P(c);OGATEB,XP(C)::QAR(E)
        • P(a);OGATE::QAR2(E)
        • P(d);OGATEB::QAB(E)
      • Refutation
        • P(d);
    • Try
      • Q(E);
      • Vars
        • P(c);OGATEB,XP(C)::QAR2(E)
        • P(a);OGATEB::QAB(E)
        • P(d);N_GUARD::QAB1(E)
      • Refutation
        • P(d);
    • Try
      • Q(E);
      • Threat
        • QAB(E),XP(d)
      • Vars
        • P(d);::QAB(E)
      • Refutation
        • P(d);
  • Actual
    • Q(E);
    • Vars
      • P(c);OGATE,P_SPINP(c),XP(C)::QAR1(E),XP(c)
      • P(a);OGATEB::QAB(E)
      • P(d);OGATE::QAR(E)+P(C),XP(d),EP
      • P(d);OGATE::QAR(E)+P(C),XP(d)
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