MESON Chess Problem Database

Problem Display
PID: 138156 (8/8/p7/K7/8/4Q3/4b3/3NkN2 w - - 0 1)

Nesic, Milivoj S

Politika, 1962

8/8/p7/K7/8/4Q3/4b3/3NkN2

#2

4 + 3

5454 Near Snap 2011
6490 yacpdb 2011

SOLUTION

  • SOUND
  • Sets
    • 1...Kxd1
      • 2.Qd2#
    • 1...Kxf1
      • 2.Qf2#
  • Tries
    • 1.Ka4?
      • 1...Kxd1
        • 2.Qd2#
      • 1...Kxf1
        • 2.Qf2#
      • 1...a5!
    • 1.Kb4?
      • 1...Kxd1
        • 2.Qd2#
      • 1...Kxf1
        • 2.Qf2#
      • 1...a5+!
    • 1.Kb6?
      • 1...Kxd1
        • 2.Qd2#
      • 1...Kxf1
        • 2.Qf2#
      • 1...a5!
    • 1.Qc3+?
      • 1...Kxd1
        • 2.Se3#
        • 2.Qd2#
      • 1...Kxf1!
    • 1.Qg3+?
      • 1...Kxf1
        • 2.Se3#
        • 2.Qf2#
      • 1...Kxd1!
  • Keys
    • 1.Qe4!
      • 1...Kxd1
        • 2.Qb1#
      • 1...Kxf1
        • 2.Qh1#

Anticipated by 206996(1859), 222837(1884), 193956(1916), 21141(1917), 71194(1917), 227663(1926), 76800(1945), 142699(1954), 105209(1958)

FEATURES

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