MESON Chess Problem Database

Problem Display
PID: 53030 (K2B4/1Q5q/NP6/k1N5/p7/r6p/8/5B2 w - - 0 1)

Gabor, Nicholas

The Chess Review, 1933

K2B4/1Q5q/NP6/k1N5/p7/r6p/8/5B2

#2

7 + 5

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb7+
      • 2.Sxb7#
  • Tries
    • 1.Qd7?
      • threat
        • 2.Sb7#
        • 2.Qb5#
        • 2.b7#
      • 1...Qe4+
        • 2.b7#
      • 1...Qb1
        • 2.Sb7#
      • 1...Qd3
        • 2.b7#
      • 1...Qg6
        • 2.Sb7#
        • 2.Qb5#
      • 1...Qg8
        • 2.Sb7#
        • 2.Qb5#
      • 1...Qh4
        • 2.Sb7#
        • 2.Qb5#
      • 1...Qh6
        • 2.Sb7#
        • 2.Qb5#
      • 1...Qe7
        • 2.Sb7#
        • 2.Qb5#
      • 1...Qh8
        • 2.Sb7#
        • 2.Qb5#
      • 1...Rb3
        • 2.Sb7#
        • 2.Qxa4#
      • 1...Rd3
        • 2.Qxa4#
        • 2.b7#
      • 1...Qxd7!
    • 1.Qxh7?
      • threat
        • 2.Sb7#
        • 2.b7#
      • 1...Rb3
        • 2.Sb7#
      • 1...Rd3!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qb4#
      • 1...Qxe4+
        • 2.b7#
      • 1...Qa7+
        • 2.bxa7#
      • 1...Qb7+
        • 2.Sxb7#
      • 1...Qh4
        • 2.Sb7#
      • 1...Rb3
        • 2.Qxa4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • Q(e);CHECK,XQ(E)::S(B),XQ(e)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(3)
      • Vars
        • Q(e);CHECK::B(G)+P(D)
        • Q(e);::S(B)
        • Q(e);::B(G)+P(D)
      • Refutation
        • Q(e);XQ(E)
    • Try
      • Q(E);XQ(e)
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::S(B)
      • Refutation
        • R(a);
  • Actual
    • Q(E);
    • Threat
      • QAB1(E)
    • Vars
      • Q(e);CHECK,N_GUARD,XQ(E)::B(G)+P(D)
      • Q(e);CHECK,OGATE::B(G)+P(D),XQ(e)
      • Q(e);CHECK,N_GUARD::S(B),XQ(e)
      • Q(e);N_GUARD::S(B)
      • R(a);N_GUARD::QAR1(E),XP(c)
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