MESON Chess Problem Database

Problem Display
PID: 106194 (8/4N2p/3p3K/r1n5/4Nkpp/1pQ5/q1b2PP1/3r4 w - - 0 1)

Opalek, Cyril

Praca, 1950

8/4N2p/3p3K/r1n5/4Nkpp/1pQ5/q1b2PP1/3r4

#2

6 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Kxe4
      • 2.Qe3#
  • Tries
    • 1.Qg3+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...hxg3!
    • 1.g3+?
      • 1...Kxe4
        • 2.Qe3#
      • 1...hxg3!
  • Keys
    • 1.Sg3!
      • threat
        • 2.Qe3#
      • 1...Re1
        • 2.Sd5#
      • 1...Rd3
        • 2.Qf6#
      • 1...Bd3
        • 2.Sd5#
      • 1...Be4
        • 2.Sh5#
      • 1...Sd3
        • 2.Qd4#
      • 1...Se4
        • 2.Se2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 1
  • Sets
    • K(e);P-FLIGHT,XS(D)::QAR1(C)
  • Tries
    • Try
      • Q(C);CHECK
      • Vars
        • K(e);P-FLIGHT,XS(D)::QAR1(C)
      • Refutation
        • P(g);XQ(C)
    • Try
      • P(B);CHECK
      • Vars
        • K(e);P-FLIGHT,XS(D)::QAR1(C)
      • Refutation
        • P(g);XP(B)
  • Actual
    • S(D);
    • Threat
      • QAB1(C)
    • Vars
      • R(a);N_GUARD::S(F)
      • R(a);S_CUTB(c)::QAR2(C)
      • B(c);S_CUTR(a)::S(F)
      • B(c);SBLOCK::S(D)
      • S(i);N_GUARD,S_CUTB(c),S_CUTR(a)::QAR2(C)
      • S(i);SBLOCK::S(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).