MESON Chess Problem Database

Problem Display
PID: 140981 (8/3Qp2N/3p4/1P1k4/8/3PP3/4K3/1R6 w - - 0 1)

Shedey, Sergey Oleksandrovich

1st HM., Source?, 1972

8/3Qp2N/3p4/1P1k4/8/3PP3/4K3/1R6

#2

7 + 3

6490 yacpdb 2011
5454 Near Snap 2013

SOLUTION

  • SOUND
  • Sets
    • 1...Kc5
      • 2.Qc6#
  • Tries
    • 1.Sg5?
      • 1...Kc5
        • 2.Qc6#
      • 1...Ke5
        • 2.Qe6#
      • 1...e5
        • 2.Qc6#
      • 1...e6!
    • 1.Sf6+?
      • 1...Kc5
        • 2.Qc6#
        • 2.Qa7#
        • 2.Qc7#
      • 1...exf6
        • 2.Qf5#
      • 1...Ke5!
    • 1.Sf8?
      • 1...Kc5
        • 2.Qc6#
      • 1...Ke5
        • 2.Qe6#
      • 1...e5
        • 2.Qc6#
      • 1...e6!
    • 1.Qc6+?
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6!
    • 1.Qb7+?
      • 1...Kc5
        • 2.Qc6#
      • 1...Ke5
        • 2.Qe4#
      • 1...Ke6!
    • 1.d4?
      • 1...Kc4
        • 2.Qc6#
      • 1...Ke4
        • 2.Qe6#
      • 1...e6
        • 2.Qc6#
      • 1...e5!
    • 1.b6?
      • threat
        • 2.Rb5#
      • 1...Kc5
        • 2.Rb5#
        • 2.Qb5#
      • 1...Ke5!
  • Keys
    • 1.Qg4!
      • 1...Kc5
        • 2.Qd4#
      • 1...Ke5
        • 2.Qe4#
      • 1...e5
        • 2.Qc4#
      • 1...e6
        • 2.Qd4#

This anticipates 84193(1989)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • K(a);N_SPINP(b),P-FLIGHT::QAR1(F)
  • Tries
    • Try
      • S(G);
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(F)
        • P(c);SBLOCK::QAB1(F)
      • Refutation
        • P(c);
    • Try
      • S(G);CHECK
      • Vars
        • P(c);XS(G)::QAR2(F)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
    • Try
      • S(G);
      • Vars
        • K(a);N_SPINP(b),P-FLIGHT::QAR1(F)
        • P(c);SBLOCK::QAB1(F)
      • Refutation
        • P(c);
    • Try
      • Q(F);CHECK,N_PINP(b)
      • Vars
        • K(a);OGATE,P-FLIGHT::QAR1(F)
      • Refutation
        • K(a);P_SPINP(b),S_FLIGHT
    • Try
      • Q(F);CHECK,N_PINP(b)
      • Vars
        • K(a);P-FLIGHT::QAR1(F)
        • K(a);OGATE,P-FLIGHT::QAR1(F)
      • Refutation
        • K(a);S_FLIGHT
    • Try
      • P(C);
      • Vars
        • K(a);N_SPINP(b),S_FLIGHT::QAR2(F)
        • P(c);SBLOCK::QAB1(F)
      • Refutation
        • P(c);
    • Try
      • P(E);
      • Threat
        • R(A)
      • Refutation
        • K(a);N_SPINP(b),P-FLIGHT
  • Actual
    • Q(F);N_PINP(b)
    • Vars
      • K(a);P-FLIGHT::QAB1(F)
      • K(a);P-FLIGHT::QAR1(F)
      • P(c);SBLOCK::QAB1(F)
      • P(c);SBLOCK::QAR1(F)
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