MESON Chess Problem Database

Problem Display
PID: 203054 (8/1K6/2P1p3/3kp3/1P1N4/1PP5/8/1Q6 w - - 0 1)

Krepko, Piotr Andrinovich

Sachova skladba, 1990

8/1K6/2P1p3/3kp3/1P1N4/1PP5/8/1Q6

#2

7 + 3

5454 Near Snap 2021

SOLUTION

  • SOUND
  • Tries
    • 1.Sf3?
      • threat
        • 2.Qd3#
      • 1...e4
        • 2.Qd1#
      • 1...Kd6!
    • 1.Qd3?
      • threat
        • 2.Sc2#
        • 2.Se2#
        • 2.Sf3#
        • 2.Sb5#
        • 2.Sf5#
      • 1...Kd6
        • 2.Sf5#
      • 1...exd4
        • 2.Qxd4#
      • 1...e4!
    • 1.Qf5?
      • 1...Kd6
        • 2.Qxe6#
      • 1...exf5!
    • 1.Qg6?
      • 1...Kd6
        • 2.Qxe6#
      • 1...e4
        • 2.Qxe6#
      • 1...exd4!
  • Keys
    • 1.Qd1!
      • 1...Ke4
        • 2.Qf3#
      • 1...Kd6
        • 2.Sf5#
      • 1...exd4
        • 2.Qxd4#
      • 1...e4
        • 2.Sf3#

Anticipated by 21309(1918), 77239(1927), 102513(1964), 12404(1978), 150698(1982), 79321(1988)

This anticipates 245207(2000)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
  • Tries
    • Try
      • S(E);
      • Threat
        • QAR2(A)
      • Vars
        • P(b);SBLOCK::QAR(A)
      • Refutation
        • K(a);P-FLIGHT
    • Try
      • Q(A);
      • Threat
        • DUALS(5)
      • Vars
        • K(a);P-FLIGHT::QAR(A)+S(E),DCHECK
        • P(b);OGATE,P_SPINP(b),XS(E)::QAR1(A),XP(b)
      • Refutation
        • P(b);
    • Try
      • Q(A);P_PINP(b)
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(A),XP(c)
      • Refutation
        • P(c);N_SPINP(b),XQ(A)
    • Try
      • Q(A);
      • Vars
        • K(a);P-FLIGHT,P_SPINP(c)::QAR1(A),XP(c)
        • P(b);::QAB1(A),XP(c)
      • Refutation
        • P(b);XS(E)
  • Actual
    • Q(A);
    • Vars
      • K(a);S_FLIGHT::QAB1(A)
      • K(a);P-FLIGHT::QAR(A)+S(E),DCHECK
      • P(b);OGATE,P_SPINP(b),XS(E)::QAR1(A),XP(b)
      • P(b);SBLOCK::QAR(A)+S(E)
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