MESON Chess Problem Database

Problem Display
PID: 216695 (8/8/8/2K5/k7/2Q5/2n5/8 w - - 0 1)

Kashcheev, Niktopolion Pavlovich

Land og Folk, 1975

8/8/8/2K5/k7/2Q5/2n5/8

#2

2 + 2

15148 Sadier Collection 2020
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sa1
      • 2.Qb4#
    • 1...Se1
      • 2.Qb4#
    • 1...Sa3
      • 2.Qb4#
    • 1...Se3
      • 2.Qb4#
    • 1...Sb4
      • 2.Qxb4#
    • 1...Sd4
      • 2.Qb4#
  • Tries
    • 1.Qxc2+?
      • 1...Ka5
        • 2.Qa2#
      • 1...Ka3!
    • 1.Qb3+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Kxb3!
    • 1.Qc4+?
      • 1...Ka5
        • 2.Qb5#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Ka3!
  • Keys
    • 1.Qb2!
      • 1...Ka5
        • 2.Qb5#
      • 1...Sa1
        • 2.Qa2#
        • 2.Qb4#
      • 1...Se1
        • 2.Qa2#
        • 2.Qb4#
      • 1...Sa3
        • 2.Qb4#
      • 1...Se3
        • 2.Qa2#
        • 2.Qb4#
      • 1...Sb4
        • 2.Qxb4#
      • 1...Sd4
        • 2.Qa2#
        • 2.Qb4#

Anticipated by 203503(1924), 227718(1926), 227885(1926), 120861(1967)

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 4
  • Sets
    • S(a);N_GUARD::QAR1(A)
    • S(a);N_GUARD::QAR1(A),XS(a)
  • Tries
    • Try
      • Q(A);CHECK,XS(a)
      • Vars
        • K(b);P-FLIGHT::QAR(A)
      • Refutation
        • K(b);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
      • Refutation
        • K(b);S_FLIGHT,XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • K(b);P-FLIGHT::QAR1(A)
        • S(a);N_GUARD,P_SPINS(a)::QAR1(A),XS(a)
      • Refutation
        • K(b);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(b);P-FLIGHT::QAR1(A)
      • S(a);N_GUARD::QAR1(A)
      • S(a);N_GUARD::QAR1(A),XS(a)
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