MESON Chess Problem Database

Problem Display
PID: 231208 (8/6p1/3p2P1/QK1pkp2/3Np2P/4p2P/4P3/8 w - - 0 1)

Lundberg, T

Schackvarlden, 1927

8/6p1/3p2P1/QK1pkp2/3Np2P/4p2P/4P3/8

#2

7 + 7

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd4
      • 2.Qa1#
  • Tries
    • 1.Qb4?
      • 1...Kf4
        • 2.Qxd6#
      • 1...Kf6
        • 2.Qxd6#
      • 1...f4!
    • 1.Qb6?
      • 1...Kf4
        • 2.Qxd6#
      • 1...Kf6
        • 2.Qxd6#
      • 1...f4!
    • 1.Qa3?
      • 1...Kxd4
        • 2.Qb2#
        • 2.Qa1#
      • 1...Kf4
        • 2.Qxd6#
      • 1...Kf6
        • 2.Qxd6#
      • 1...f4!
    • 1.Qa6?
      • 1...Kxd4
        • 2.Qa1#
      • 1...Kf4
        • 2.Qxd6#
      • 1...Kf6
        • 2.Qxd6#
      • 1...f4!
  • Keys
    • 1.Qc7!
      • 1...Kxd4
        • 2.Qxg7#
      • 1...Kf4
        • 2.Qxd6#
      • 1...Kf6
        • 2.Qxd6#
      • 1...f4
        • 2.Qxg7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(d);OGATEB,S_FLIGHT,XS(C)::QAB(E)
  • Tries
    • Try
      • Q(E);
      • Vars
        • K(d);S_FLIGHT::QAB(E),XP(f)
        • K(d);S_FLIGHT::QAR2(E),XP(f)
      • Refutation
        • P(e);
    • Try
      • Q(E);
      • Vars
        • K(d);S_FLIGHT::QAB(E),XP(f)
        • K(d);P_SPINP(f),S_FLIGHT::QAR2(E),XP(f)
      • Refutation
        • P(e);
    • Try
      • Q(E);
      • Vars
        • K(d);S_FLIGHT::QAB(E),XP(f)
        • K(d);S_FLIGHT::QAR2(E),XP(f)
      • Refutation
        • P(e);
    • Try
      • Q(E);
      • Vars
        • K(d);OGATEB,S_FLIGHT,XS(C)::QAB(E)
        • K(d);S_FLIGHT::QAB(E),XP(f)
        • K(d);P_SPINP(f),S_FLIGHT::QAR2(E),XP(f)
      • Refutation
        • P(e);
  • Actual
    • Q(E);P_PINP(f)
    • Vars
      • K(d);N_SPINP(f),S_FLIGHT,XS(C)::QAB(E),XP(g)
      • K(d);S_FLIGHT::QAB(E),XP(f)
      • K(d);N_SPINP(f),S_FLIGHT::QAR2(E),XP(f)
      • P(e);SBLOCK::QAB(E),XP(g)
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