MESON Chess Problem Database

Problem Display
PID: 272591 (5r2/3Q1n1P/3ppk1P/1r1R1p1K/R7/5NN1/8/8 w - - 0 1)

Shtern, David

Variantim, 2023

5r2/3Q1n1P/3ppk1P/1r1R1p1K/R7/5NN1/8/8

#2

8 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rg8
      • 2.hxg8S#
    • 1...Se5
      • 2.Qg7#
    • 1...Sg5
      • 2.Qg7#
    • 1...Sd8
      • 2.Qg7#
    • 1...Sh8
      • 2.Qg7#
    • 1...f4
      • 2.Se4#
      • 2.Rxf4#
  • Tries
    • 1.Sg5?
      • threat
        • 2.Qxe6#
      • 1...Sxg5
        • 2.Qg7#
      • 1...exd5
        • 2.Qe6#
      • 1...Re8
        • 2.Qxf7#
      • 1...Sd8
        • 2.Qg7#
      • 1...e5
        • 2.Qe6#
      • 1...Sxh6!
    • 1.Rf4?
      • threat
        • 2.Se4#
      • 1...exd5
        • 2.Rxf5#
      • 1...Sg5
        • 2.Qg7#
      • 1...Rb4!
    • 1.Ra7?
      • threat
        • 2.Qe7#
      • 1...Re8
        • 2.Qxf7#
      • 1...Rb7!
    • 1.h8Q+?
      • 1...Sxh8
        • 2.Qg7#
      • 1...Rxh8!
    • 1.h8B+?
      • 1...Sxh8
        • 2.Qg7#
      • 1...Rxh8!
  • Keys
    • 1.Rg4!
      • threat
        • 2.Rg6#
      • 1...fxg4
        • 2.Se4#
      • 1...Rg8
        • 2.hxg8S#
      • 1...Se5
        • 2.Qg7#
      • 1...Sg5
        • 2.Qg7#
      • 1...Sh8
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(g);OGATE::PXR(g)=S
    • S(f);OGATE::QAB1(G)
  • Tries
    • Try
      • S(A);
      • Threat
        • QAR1(G),XP(d)
      • Vars
        • S(f);OGATE,XS(A)::QAB1(G)
        • P(d);XR(D)::QAR1(G)
        • R(g);N_GUARD::QAR1(G),XS(f)
        • S(f);OGATE::QAB1(G)
        • P(d);::QAR1(G)
      • Refutation
        • S(f);XP(F)
    • Try
      • R(C);P_PINP(b)
      • Threat
        • S(B)
      • Vars
        • P(d);N_GUARD,XR(D)::R1(C),XP(b)
        • S(f);OGATE::QAB1(G)
      • Refutation
        • R(a);
    • Try
      • R(C);
      • Threat
        • QAB1(G)
      • Vars
        • R(g);N_GUARD::QAR1(G),XS(f)
      • Refutation
        • R(a);
    • Try
      • P(H);CHECK
      • Vars
        • S(f);OGATE,XQ(H)::QAB1(G)
      • Refutation
        • R(g);P_PINP(F),XQ(H)
    • Try
      • P(H);CHECK
      • Vars
        • S(f);OGATE,XB(H)::QAB1(G)
      • Refutation
        • R(g);P_PINP(F),XB(H)
  • Actual
    • R(C);
    • Threat
      • R1(C)
    • Vars
      • P(b);N_GUARD,P_PINR(D),XR(C)::S(B)
      • R(g);OGATE::PXR(g)=S
      • S(f);OGATE::QAB1(G)
HTML5 logo

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).