MESON Chess Problem Database

Problem Display
PID: 18099 (8/8/4b3/6pN/7k/8/7K/3Q4 w - - 0 1)

le Grand, Henk

Probleemblad, 1953

8/8/4b3/6pN/7k/8/7K/3Q4

#2

3 + 3

3295 Einfuhrung in die Welt des Schachproblem 1984
3310 2345 Chess Problems 1997
5454 Near Snap 2009

SOLUTION

  • SOUND
  • Tries
    • 1.Sg3?
      • threat
        • 2.Qh5#
      • 1...g4
        • 2.Qd8#
      • 1...Bf7
        • 2.Sf5#
      • 1...Bg4!
    • 1.Sf4?
      • threat
        • 2.Sg2#
        • 2.Sg6#
        • 2.Qh5#
      • 1...g4
        • 2.Qd8#
      • 1...Bh3
        • 2.Sg6#
        • 2.Qh5#
      • 1...Bg4
        • 2.Qe1#
      • 1...Bd5
        • 2.Sg6#
        • 2.Qh5#
      • 1...Bf5
        • 2.Sg2#
        • 2.Qh5#
      • 1...Bf7
        • 2.Sg2#
      • 1...gxf4!
    • 1.Sf6?
      • threat
        • 2.Qh5#
        • 2.Qe1#
      • 1...Bg4
        • 2.Qxg4#
        • 2.Qe1#
      • 1...Bf7
        • 2.Qg4#
        • 2.Qe1#
      • 1...g4!
  • Keys
    • 1.Sg7!
      • threat
        • 2.Qh5#
      • 1...g4
        • 2.Qd8#
      • 1...Bg4
        • 2.Qe1#
      • 1...Bf7
        • 2.Sf5#

This anticipates 79330(1977)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(C);
      • Threat
        • QAR1(A)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(A)
        • B(c);N_GUARD::S(C)
      • Refutation
        • B(c);
    • Try
      • S(C);
      • Threat
        • DUALS(3)
      • Vars
        • P(b);OGATEB,SBLOCK::QAB(A)
        • B(c);SBLOCK::QAB(A)
        • B(c);::S(C)
      • Refutation
        • P(b);XS(C)
    • Try
      • S(C);
      • Threat
        • DUALS(2)
      • Refutation
        • P(b);
  • Actual
    • S(C);
    • Threat
      • QAR1(A)
    • Vars
      • P(b);OGATEB,SBLOCK::QAB(A)
      • B(c);SBLOCK::QAB(A)
      • B(c);N_GUARD::S(C)
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