MESON Chess Problem Database

Problem Display
PID: 79228 (5N2/3p3Q/8/1K1kp3/3p4/8/8/8 w - - 0 1)

Asplund, Per Ivan Rune

Springaren, 1953

5N2/3p3Q/8/1K1kp3/3p4/8/8/8

#2

3 + 4

5454 Near Snap 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kd6
      • 2.Qxd7#
    • 1...d3
      • 2.Qxd3#
    • 1...d6
      • 2.Qb7#
  • Tries
    • 1.Qf5?
      • 1...Kd6
        • 2.Qxd7#
      • 1...d3
        • 2.Qxd3#
      • 1...d6!
    • 1.Qf7+?
      • 1...Kd6
        • 2.Qxd7#
      • 1...Ke4!
  • Keys
    • 1.Qc2!
      • 1...Kd6
        • 2.Qc5#
      • 1...d3
        • 2.Qxd3#
      • 1...e4
        • 2.Qc5#
      • 1...d6
        • 2.Qc6#

Anticipated by 29048(1877), 110805(1922)

This anticipates 77680(1960), 135534(1988)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 2
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • K(b);P-FLIGHT::QAR1(B),XP(d)
    • P(a);OGATEB::QAR2(B),XP(a)
    • P(d);OGATE,SBLOCK::QAB(B)
  • Tries
    • Try
      • Q(B);P_PINP(c)
      • Vars
        • K(b);N_SPINP(c),P-FLIGHT::QAR1(B),XP(d)
        • P(a);OGATEB::QAR2(B),XP(a)
      • Refutation
        • P(d);
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(B),XP(d)
      • Refutation
        • K(b);S_FLIGHT
  • Actual
    • Q(B);
    • Vars
      • K(b);P-FLIGHT::QAB1(B)
      • P(a);OGATEB::QAR2(B),XP(a)
      • P(c);SBLOCK::QAR1(B)
      • P(d);N_GUARD::QAB1(B)
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