MESON Chess Problem Database

Problem Display
PID: 179797 (5rR1/r5p1/p5R1/8/8/4pp2/1Q6/K6k w - - 0 1)

Zalkind, Lazar Borissovich

La Strategie, 1916

5rR1/r5p1/p5R1/8/8/4pp2/1Q6/K6k

#2

4 + 7

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rf6
      • 2.Rh8#
    • 1...Rf7
      • 2.Rh8#
  • Tries
    • 1.R8xg7?
      • threat
        • 2.Rg1#
        • 2.Rh6#
      • 1...e2
        • 2.Rh6#
      • 1...f2
        • 2.Rh6#
      • 1...Rf4
        • 2.Rg1#
      • 1...Rf5
        • 2.Rg1#
      • 1...Rf6
        • 2.Rg1#
      • 1...Rh8
        • 2.Rg1#
      • 1...Rxg7!
    • 1.Qd4?
      • threat
        • 2.Qh4#
      • 1...Kh2
        • 2.Qh4#
      • 1...Rf4!
    • 1.Qf2?
      • threat
        • 2.Rg1#
        • 2.Qg1#
        • 2.Qh4#
      • 1...Rf4
        • 2.Rg1#
        • 2.Qg1#
      • 1...exf2!
    • 1.Qb4?
      • threat
        • 2.Qh4#
      • 1...Kh2
        • 2.Qh4#
      • 1...Rf4!
  • Keys
    • 1.Qf6!
      • threat
        • 2.Qh4#
      • 1...Kh2
        • 2.Qh4#
      • 1...Rxf6
        • 2.Rh8#
      • 1...gxf6
        • 2.Rh6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(g);N_GUARD::R(D)
  • Tries
    • Try
      • R(D);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::R(C)
        • P(c);::R(C)
        • R(g);::R1(C)
      • Refutation
        • R(e);XR(D)
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • R(g);
    • Try
      • Q(B);
      • Threat
        • DUALS(3)
      • Refutation
        • P(b);XQ(B)
    • Try
      • Q(B);
      • Threat
        • QAR(B)
      • Vars
        • K(a);P-FLIGHT::QAR2(B)
      • Refutation
        • R(g);
  • Actual
    • Q(B);
    • Threat
      • QAR(B)
    • Vars
      • K(a);P-FLIGHT::QAR2(B)
      • R(g);N_GUARD,XQ(B)::R(D)
      • P(f);N_GUARD,XQ(B)::R(C)
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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).