MESON Chess Problem Database

Problem Display
PID: 231465 (3n4/8/4p2R/5kp1/8/4Q1K1/8/8 w - - 0 1)

Szentgyorgy, Erno

Magyar Sakkvilag, 1927

3n4/8/4p2R/5kp1/8/4Q1K1/8/8

#2

3 + 4

6490 yacpdb 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Qxe6#
    • 1...Sb7
      • 2.Qxe6#
    • 1...Sf7
      • 2.Qxe6#
    • 1...g4
      • 2.Qf4#
    • 1...e5
      • 2.Qf3#
  • Tries
    • 1.Rxe6?
      • threat
        • 2.Qe4#
        • 2.Qe5#
      • 1...Sc6
        • 2.Qe4#
      • 1...Sf7
        • 2.Qe4#
      • 1...g4
        • 2.Qe5#
      • 1...Sxe6!
    • 1.Qe2?
      • 1...Sc6
        • 2.Qxe6#
      • 1...Sb7
        • 2.Qxe6#
      • 1...Sf7
        • 2.Qxe6#
      • 1...e5
        • 2.Qf3#
        • 2.Qg4#
      • 1...g4!
  • Keys
    • 1.Qd4!
      • threat
        • 2.Rf6#
      • 1...g4
        • 2.Qf4#
      • 1...e5
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = BLOCK_THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 0
    • REMOVED MATES = 3
  • Sets
    • S(d);N_GUARD::QAB1(A),XP(c)
    • P(b);N_GUARD::QAR1(A)
    • P(c);SBLOCK::QAR2(A)
  • Tries
    • Try
      • R(C);XP(c)
      • Threat
        • DUALS(2)
      • Vars
        • S(d);::QAB1(A)
        • P(b);::QAR1(A)
      • Refutation
        • S(d);XR(C)
    • Try
      • Q(A);
      • Vars
        • S(d);N_GUARD::QAB1(A),XP(c)
      • Refutation
        • P(b);
  • Actual
    • Q(A);
    • Threat
      • R1(C)
    • Vars
      • P(b);N_GUARD::QAR1(A)
      • P(c);SBLOCK::QAB1(A)
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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).