MESON Chess Problem Database

Problem Display
PID: 245261 (5KQR/5NPq/4pk1p/4Npn1/5P2/8/8/8 w - - 0 1)

Dombrovskis, Alfreds A

64 Shakhmatnoe obozrenie, 1972

5KQR/5NPq/4pk1p/4Npn1/5P2/8/8/8

#2

7 + 6

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Sd7#
    • 1...Qxg7+
      • 2.Qxg7#
    • 1...Qxh8
      • 2.gxh8Q#
      • 2.gxh8B#
    • 1...Sxf7
      • 2.Qxf7#
    • 1...h5
      • 2.fxg5#
  • Tries
    • 1.Sxg5?
      • threat
        • 2.Sxh7#
        • 2.Qxe6#
        • 2.Qf7#
      • 1...Qxg7+
        • 2.Qxg7#
      • 1...Qxh8
        • 2.gxh8Q#
        • 2.gxh8B#
      • 1...hxg5
        • 2.Qf7#
      • 1...Qg6
        • 2.Sd7#
        • 2.Qxe6#
      • 1...Qxg8+!
    • 1.Sd6?
      • threat
        • 2.Se8#
      • 1...Qxg7+
        • 2.Qxg7#
      • 1...Qg6
        • 2.Sd7#
      • 1...Qxg8+!
    • 1.Rxh7?
      • threat
        • 2.Rxh6#
      • 1...Sxf7
        • 2.Qxf7#
      • 1...h5
        • 2.Rh6#
        • 2.fxg5#
      • 1...Sxh7+!
    • 1.Qxh7?
      • threat
        • 2.Sd7#
        • 2.Qg6#
        • 2.Qxh6#
        • 2.g8S#
      • 1...Sxf7
        • 2.Sd7#
        • 2.Qg6#
        • 2.g8S#
      • 1...h5
        • 2.Sd7#
        • 2.Qg6#
        • 2.Qh6#
        • 2.fxg5#
        • 2.g8S#
      • 1...Sxh7+!
  • Keys
    • 1.Sxh6!
      • 1...Qxg8+
        • 2.Sxg8#
      • 1...Qxg7+
        • 2.Qxg7#
      • 1...Qxh6
        • 2.Rxh6#
      • 1...Qxh8
        • 2.gxh8Q#
        • 2.gxh8B#
      • 1...Qg6
        • 2.Sd7#
      • 1...Sf3
        • 2.Qf7#
      • 1...Sh3
        • 2.Qf7#
      • 1...Se4
        • 2.Qf7#
      • 1...Sf7
        • 2.Qxf7#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(f);SBLOCK::S(B)
    • Q(f);CHECK,OGATE,XP(D)::QAB1(F),XQ(f)
    • Q(f);OGATE,P_PINQ(F),XR(G)::PXQ(f)=Q
    • S(b);OGATE,XS(C)::QAR1(F),XS(b)
    • P(e);N_GUARD::P(A),XS(b)
  • Tries
    • Try
      • S(C);XS(b)
      • Threat
        • DUALS(3)
      • Vars
        • Q(f);CHECK,OGATE,XP(D)::QAB1(F),XQ(f)
        • Q(f);OGATE,P_PINQ(F),XR(G)::PXQ(f)=Q
        • P(e);XS(C)::QAR1(F)
      • Refutation
        • Q(f);CHECK,XQ(F)
    • Try
      • S(C);
      • Threat
        • S(C)
      • Vars
        • Q(f);CHECK,OGATE,XP(D)::QAB1(F),XQ(f)
        • Q(f);SBLOCK::S(B)
      • Refutation
        • Q(f);CHECK,XQ(F)
    • Try
      • R(G);XQ(f)
      • Threat
        • R(G),XP(e)
      • Vars
        • S(b);OGATE,XS(C)::QAR1(F),XS(b)
      • Refutation
        • S(b);CHECK,XR(G)
    • Try
      • Q(F);XQ(f)
      • Threat
        • DUALS(4)
      • Refutation
        • S(b);CHECK,XQ(F)
  • Actual
    • S(C);XP(e)
    • Vars
      • Q(f);CHECK,XQ(F)::S(C),XQ(f)
      • Q(f);CHECK,OGATE,XP(D)::QAB1(F),XQ(f)
      • Q(f);OGATE,P_PINP(D),XS(C)::R(G),XQ(f)
      • Q(f);OGATE,P_PINQ(F),XR(G)::PXQ(f)=Q
      • Q(f);SBLOCK::S(B)
      • S(b);N_GUARD::QAR1(F)
      • S(b);N_GUARD::QAR1(F),XS(b)
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