MESON Chess Problem Database

Problem Display
PID: 231088 (8/5Q2/8/8/8/6K1/7n/7k w - - 0 1)

Svoboda, Rudolf

Neue Leipziger Zeitung, 1927

8/5Q2/8/8/8/6K1/7n/7k

#2

2 + 2

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sf1+
      • 2.Qxf1#
    • 1...Sg4
      • 2.Qf1#
  • Tries
    • 1.Qa2?
      • threat
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Kg1
        • 2.Qg2#
      • 1...Sf3
        • 2.Qg2#
      • 1...Sg4
        • 2.Qb1#
        • 2.Qa1#
        • 2.Qg2#
      • 1...Sf1+!
    • 1.Qd5+?
      • 1...Kg1
        • 2.Qg2#
      • 1...Sf3!
    • 1.Qf3+?
      • 1...Kg1
        • 2.Qg2#
      • 1...Sxf3!
    • 1.Qb7+?
      • 1...Kg1
        • 2.Qg2#
      • 1...Sf3!
  • Keys
    • 1.Qf2!
      • threat
        • 2.Qg2#
        • 2.Qxh2#
      • 1...Sf1+
        • 2.Qxf1#
      • 1...Sf3
        • 2.Qg2#
      • 1...Sg4
        • 2.Qe1#
        • 2.Qf1#
        • 2.Qg2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(b);CHECK,N_GUARD::QAR2(B),XS(b)
    • S(b);N_GUARD::QAR2(B)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
        • S(b);::QAB1(B)
      • Refutation
        • S(b);CHECK
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • S(b);P_SPINS(b)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • S(b);XQ(B)
    • Try
      • Q(B);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR1(B)
      • Refutation
        • S(b);P_SPINS(b)
  • Actual
    • Q(B);
    • Threat
      • DUALS(2)
    • Vars
      • S(b);CHECK,N_GUARD::QAR2(B),XS(b)
      • S(b);::QAB1(B)
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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).