MESON Chess Problem Database

Problem Display
PID: 206996 (3NkN2/4b3/4Q3/8/8/8/6p1/6Kb w - - 0 1)

Anonymous

New York Clipper, 1859

3NkN2/4b3/4Q3/8/8/8/6p1/6Kb

#2

4 + 4

5454 Near Snap 2020
6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd8
      • 2.Qd7#
    • 1...Kxf8
      • 2.Qf7#
  • Tries
    • 1.Qc6+?
      • 1...Kxd8
        • 2.Se6#
        • 2.Qd7#
      • 1...Kxf8!
    • 1.Qg6+?
      • 1...Kxf8
        • 2.Se6#
        • 2.Qf7#
      • 1...Kxd8!
  • Keys
    • 1.Qe5!
      • 1...Kxd8
        • 2.Qb8#
      • 1...Kxf8
        • 2.Qh8#

This anticipates 23002(1881), 222837(1884), 193956(1916), 21141(1917), 71194(1917), 227663(1926), 76800(1945), 142699(1954), 105209(1958), 138156(1962), 217452(1992)

FEATURES

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