MESON Chess Problem Database

Problem Display
PID: 269867 (5Rn1/4PNkn/7R/6P1/3K4/4Q3/8/8 w - - 0 1)

Strom, Gustav

Schackvarlden, 1940

5Rn1/4PNkn/7R/6P1/3K4/4Q3/8/8

#2

7 + 3

3713 Snap 2023

SOLUTION

  • SOUND
  • Sets
    • 1...Sxg5
      • 2.Qxg5#
  • Tries
    • 1.Sd6?
      • 1...Kh8
        • 2.Qe5#
      • 1...Sxg5
        • 2.Sf5#
        • 2.Qxg5#
      • 1...Sxf8
        • 2.e8S#
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Shf6
        • 2.Sf5#
        • 2.Rf7#
      • 1...Sgf6
        • 2.Sf5#
      • 1...Sxh6!
    • 1.Sd8?
      • 1...Kh8
        • 2.Qe5#
      • 1...Sxg5
        • 2.Qxg5#
      • 1...Sxf8
        • 2.e8S#
      • 1...Sxe7
        • 2.Se6#
        • 2.Qxe7#
      • 1...Shf6
        • 2.Se6#
        • 2.Rf7#
      • 1...Sgf6
        • 2.Se6#
      • 1...Sxh6!
    • 1.Rxh7+?
      • 1...Kg6
        • 2.Qd3#
        • 2.Qe4#
      • 1...Kxh7!
    • 1.Rxg8+?
      • 1...Kxf7
        • 2.Qe6#
        • 2.e8Q#
      • 1...Kxg8!
  • Keys
    • 1.Sh8!
      • 1...Kxh8
        • 2.Qe5#
      • 1...Sxg5
        • 2.Qxg5#
      • 1...Sxf8
        • 2.e8S#
      • 1...Sxh6
        • 2.gxh6#
      • 1...Sxe7
        • 2.Qxe7#
      • 1...Shf6
        • 2.Rf7#
      • 1...Sgf6
        • 2.Rg6#

This anticipates 75922(1969)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • S(b);OGATE,XP(C)::QAR2(A),XS(b)
  • Tries
    • Try
      • S(F);
      • Vars
        • K(a);P_SPINS(b),S_CUTS(c),S_FLIGHT::QAB(A)
        • S(b);SBLOCK,XR(G)::P=S
        • S(c);OGATE,XP(E)::QAR2(A),XS(c)
        • S(c);::S(F)
      • Refutation
        • S(c);XR(D)
    • Try
      • S(F);
      • Vars
        • K(a);P_SPINS(b),S_CUTS(c),S_FLIGHT::QAB(A)
        • S(b);OGATE,XP(C)::QAR2(A),XS(b)
        • S(b);SBLOCK,XR(G)::P=S
        • S(c);::S(F)
      • Refutation
        • S(c);XR(D)
    • Try
      • R(D);CHECK,XS(b)
      • Refutation
        • K(a);P-FLIGHT,XR(D)
    • Try
      • R(G);CHECK,XS(c)
      • Refutation
        • K(a);P-FLIGHT,XR(G)
  • Actual
    • S(F);
    • Vars
      • K(a);P_SPINS(b),S_CUTS(c),S_FLIGHT,XS(F)::QAB(A)
      • S(b);OGATE,XP(C)::QAR2(A),XS(b)
      • S(b);SBLOCK,XR(G)::P=S
      • S(c);OGATE,XR(D)::P(C),XS(c)
      • S(c);OGATE,XP(E)::QAR2(A),XS(c)
      • S(b);::R1(G)
      • S(c);::R1(D)
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Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) & CSS/Javascript (jQuery, Bootstrap & DataTables).