MESON Chess Problem Database

Problem Display
PID: 142699 (8/8/7N/5Qbk/7N/8/3p4/3K4 w - - 0 1)

Krikheli, Iosif Mikhailovich

Shakhmaty v SSSR, 1954

8/8/7N/5Qbk/7N/8/3p4/3K4

#2

4 + 3

5454 Near Snap 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Kxh4
      • 2.Qg4#
    • 1...Kxh6
      • 2.Qg6#
  • Tries
    • 1.Qf3+?
      • 1...Kxh4
        • 2.Sf5#
        • 2.Qg4#
      • 1...Kxh6!
    • 1.Qf7+?
      • 1...Kxh6
        • 2.Sf5#
        • 2.Qg6#
      • 1...Kxh4!
  • Keys
    • 1.Qe5!
      • 1...Kxh4
        • 2.Qh2#
      • 1...Kxh6
        • 2.Qh8#

Anticipated by 206996(1859), 222837(1884), 193956(1916), 21141(1917), 71194(1917), 227663(1926), 76800(1945)

This anticipates 105209(1958), 138156(1962)

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • K(c);N_SPINB(b),P-FLIGHT,XS(B)::QAR1(C)
    • K(c);N_SPINB(b),P-FLIGHT,XS(D)::QAR1(C)
  • Tries
    • Try
      • Q(C);CHECK,N_PINB(b)
      • Refutation
        • K(c);P-FLIGHT,XS(D)
    • Try
      • Q(C);CHECK,N_PINB(b)
      • Refutation
        • K(c);P-FLIGHT,XS(B)
  • Actual
    • Q(C);
    • Vars
      • K(c);N_SPINB(b),OGATEB,P-FLIGHT,XS(B)::QAR2(C)
      • K(c);N_SPINB(b),OGATEB,P-FLIGHT,XS(D)::QAR2(C)
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