MESON Chess Problem Database

Problem Display
PID: 60792 (8/5Q2/K1N1p3/3k4/8/8/3NP3/8 w - - 0 1)

Fredrikson, EG

Schackvarlden, 1929

8/5Q2/K1N1p3/3k4/8/8/3NP3/8

#2

5 + 2

5454 Near Snap 2007
3713 Snap 2007

SOLUTION

  • SOUND
  • Tries
    • 1.Qxe6+?
      • 1...Kc5
        • 2.Sb3#
        • 2.Se4#
      • 1...Kxe6!
  • Keys
    • 1.Se4!
      • 1...Kc4
        • 2.Qxe6#
      • 1...Kxe4
        • 2.Qf3#
      • 1...Kxc6
        • 2.Qb7#

Anticipated by 2576(1871), 4559(1879), 167298(1879), 51071(1880), 182361(1906), 194195(1917), 195099(1918), 22068(1924), 56805(1925), 205551(1925), 231085(1927), 231139(1927)

This anticipates 58199(1997)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • Q(E);CHECK,XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(E)
  • Actual
    • S(A);
    • Vars
      • K(a);S_FLIGHT::QAB(E),XP(b)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(A)::QAB1(E)
      • K(a);N_SPINP(b),OGATEB,S_FLIGHT,XS(D)::QAB1(E)
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