MESON Chess Problem Database

Problem Display
PID: 229258 (K1Qn4/Pr6/k7/Pp6/1P6/8/8/8 w - - 0 1)

Schwarz, Bela

Nepszava, 1926

K1Qn4/Pr6/k7/Pp6/1P6/8/8/8

#2

5 + 4

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Sc6
      • 2.Qxb7#
    • 1...Se6
      • 2.Qxb7#
    • 1...Sf7
      • 2.Qxb7#
  • Tries
    • 1.Qc6+?
      • 1...Rb6
        • 2.Qxb6#
      • 1...Sxc6!
    • 1.Qc7?
      • 1...Rxa7+
        • 2.Qxa7#
      • 1...Rb8+
        • 2.axb8S#
      • 1...Rb6
        • 2.Qxb6#
      • 1...Sc6
        • 2.Qxb7#
      • 1...Se6
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qxb7#
      • 1...Rxc7!
  • Keys
    • 1.Qb8!
      • 1...Rxa7+
        • 2.Qxa7#
      • 1...Rxb8+
        • 2.axb8S#
      • 1...Rb6
        • 2.Qxb6#
      • 1...Rc7
        • 2.Qb6#
      • 1...Rd7
        • 2.Qb6#
      • 1...Re7
        • 2.Qb6#
      • 1...Rf7
        • 2.Qb6#
      • 1...Rg7
        • 2.Qb6#
      • 1...Rh7
        • 2.Qb6#
      • 1...Sc6
        • 2.Qxb7#
      • 1...Se6
        • 2.Qxb7#
      • 1...Sf7
        • 2.Qxb7#

FEATURES

  • Static
    • TYPE = WAITER
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD::QAB1(E),XR(c)
  • Tries
    • Try
      • Q(E);CHECK,N_PINR(c)
      • Vars
        • R(c);N_GUARD,P_SPINR(c)::QAR1(E),XR(c)
      • Refutation
        • S(d);XQ(E)
    • Try
      • Q(E);N_PINR(c)
      • Vars
        • R(c);CHECK,OGATE,XP(C)::QAR1(E),XR(c)
        • R(c);CHECK,OGATE::PXR(c)=S
        • R(c);N_GUARD::QAR1(E),XR(c)
        • S(d);N_GUARD::QAB1(E),XR(c)
      • Refutation
        • R(c);XQ(E)
  • Actual
    • Q(E);N_PINR(c)
    • Vars
      • R(c);CHECK,OGATE,XP(C)::QAR1(E),XR(c)
      • R(c);CHECK,OGATE,XQ(E)::PXR(c)=S
      • R(c);OGATE::QAR1(E),XR(c)
      • R(c);OGATE::QAR1(E)
      • S(d);N_GUARD::QAB1(E),XR(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).