MESON Chess Problem Database

Problem Display
PID: 180336 (6nB/4r1Pn/4Pk2/3QN1p1/4K1P1/8/8/8 w - - 0 1)

Lider, Valentin Viktorovich

2nd HM., Europe Echecs, 1978

6nB/4r1Pn/4Pk2/3QN1p1/4K1P1/8/8/8

#2

7 + 5

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Sf8
      • 2.gxf8Q#
      • 2.gxf8R#
    • 1...Sh6
      • 2.g8S#
  • Tries
    • 1.Qd6?
      • 1...Rxg7
        • 2.e7#
      • 1...Ra7
        • 2.e7#
      • 1...Rb7
        • 2.e7#
      • 1...Rc7
        • 2.e7#
      • 1...Rd7
        • 2.exd7#
      • 1...Rf7
        • 2.exf7#
        • 2.e7#
      • 1...Re8
        • 2.e7#
      • 1...Sf8
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Sh6
        • 2.g8S#
      • 1...Rxe6!
    • 1.Qd7?
      • 1...Rxe6
        • 2.Qf7#
      • 1...Rxg7
        • 2.Bxg7#
        • 2.Qf7#
      • 1...Rf7
        • 2.Qxf7#
      • 1...Re8
        • 2.Qf7#
      • 1...Sf8
        • 2.gxf8Q#
        • 2.gxf8R#
      • 1...Sh6
        • 2.g8S#
      • 1...Rxd7!
  • Keys
    • 1.Qd8!
      • 1...Kxe6
        • 2.Qb6#
      • 1...Sf8
        • 2.gxf8S#
      • 1...Sh6
        • 2.g8Q#
        • 2.g8B#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(d);OGATE::PXS(d)=Q
    • S(e);OGATE::P=S
  • Tries
    • Try
      • Q(C);
      • Vars
        • R(c);OGATE,P_SPINR(c),XP(F)::QAR(C)+P(E)
        • R(c);OGATE::QAR(C)+P(E)
        • R(c);OGATE::QAR(C)+P(E),XR(c)
        • S(d);OGATE::PXS(d)=Q
        • S(e);OGATE::P=S
      • Refutation
        • R(c);P_PINS(D),P_SPINR(c),XP(E)
    • Try
      • Q(C);
      • Vars
        • R(c);OGATE,P_PINS(D),XP(E)::QAR1(C)
        • R(c);OGATE::QAR1(C),XR(c)
        • R(c);OGATE::QAR1(C)
        • S(d);OGATE::PXS(d)=Q
        • S(e);OGATE::P=S
      • Refutation
        • R(c);XQ(C)
  • Actual
    • Q(C);P_PINR(c)
    • Vars
      • K(b);N_SPINR(c),OGATEB,P-FLIGHT,XP(E)::QAR(C)
      • S(d);OGATE::PXS(d)=S
      • S(e);OGATE::P=Q
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