MESON Chess Problem Database

Problem Display
PID: 40967 (6Q1/8/2pq4/5p2/1p3p1B/8/2PkP3/1K1NR3 w - - 0 1)

Ling, John Francis

The Problemist, 1961

6Q1/8/2pq4/5p2/1p3p1B/8/2PkP3/1K1NR3

#2

7 + 6

136 Problem Observer 2002

SOLUTION

  • SOUND
  • Sets
    • 1...Qd8
      • 2.Qxd8#
  • Tries
    • 1.Qg2?
      • threat
        • 2.e3#
        • 2.e4#
      • 1...Qc5
        • 2.e3#
      • 1...Qd3
        • 2.exd3#
      • 1...Qd4
        • 2.e3#
      • 1...Qd5
        • 2.e4#
      • 1...f3
        • 2.exf3#
      • 1...Qg6!
  • Keys
    • 1.Qa2!
      • threat
        • 2.c3#
        • 2.c4#
      • 1...Qe5
        • 2.c3#
      • 1...Qd3
        • 2.cxd3#
      • 1...Qd4
        • 2.c3#
      • 1...Qd5
        • 2.c4#
      • 1...Qe6
        • 2.c4#
      • 1...Qf6
        • 2.c3#
      • 1...b3
        • 2.cxb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 7
    • REMOVED MATES = 1
  • Sets
    • Q(f);OGATEB::QAR(G),XQ(f)
  • Tries
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • Q(f);::QAR(G)+P(E)
        • Q(f);OGATE,P_PINP(D)::QAR(G)+P(E),XQ(f)
        • P(c);OGATE::QAR(G)+P(E),XP(c)
      • Refutation
        • Q(f);
  • Actual
    • Q(G);
    • Threat
      • DUALS(2)
    • Vars
      • Q(f);::QAR(G)+P(D)
      • Q(f);OGATE,P_PINP(D)::QAR(G)+P(D),XQ(f)
      • P(b);OGATE::QAR(G)+P(D),XP(b)
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