MESON Chess Problem Database

Problem Display
PID: 78154 (8/4Q3/2N5/2pp4/5p2/1p1k1p2/1P3P2/3K4 w - - 0 1)

Pradignat, Emile Leonard

La Strategie, 1897

8/4Q3/2N5/2pp4/5p2/1p1k1p2/1P3P2/3K4

#2

5 + 6

5454 Near Snap 2017
3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...c4
      • 2.Qh7#
  • Tries
    • 1.Qxc5?
      • threat
        • 2.Qd4#
        • 2.Qxd5#
      • 1...d4
        • 2.Qxd4#
      • 1...Ke4!
    • 1.Qe1?
      • 1...Kc4
        • 2.Qf1#
      • 1...d4
        • 2.Se5#
      • 1...c4!
    • 1.Qa7?
      • 1...Kc4
        • 2.Qa6#
      • 1...Ke4
        • 2.Qh7#
      • 1...c4
        • 2.Qd4#
        • 2.Qh7#
      • 1...d4!
  • Keys
    • 1.Qb7!
      • 1...Kc4
        • 2.Qa6#
      • 1...Ke4
        • 2.Qh7#
      • 1...d4
        • 2.Se5#
      • 1...c4
        • 2.Qh7#

This anticipates 161433(1897), 256576(1901), 184792(1908), 93154(1929), 71798(1952)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(e);SBLOCK::QAB(E)
  • Tries
    • Try
      • Q(E);XP(e)
      • Threat
        • DUALS(2)
      • Vars
        • P(f);::QAR1(E),XP(f)
      • Refutation
        • K(b);S_FLIGHT
    • Try
      • Q(E);
      • Vars
        • K(b);S_FLIGHT::QAB(E)
        • P(f);SBLOCK::S(D)
      • Refutation
        • P(e);
    • Try
      • Q(E);
      • Vars
        • K(b);S_FLIGHT::QAB(E)
      • Refutation
        • P(f);
  • Actual
    • Q(E);
    • Vars
      • K(b);S_FLIGHT::QAB(E)
      • P(f);SBLOCK::S(D)
      • P(e);SBLOCK::QAB(E)
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