MESON Chess Problem Database

Problem Display
PID: 277097 (2B5/8/1pK4Q/4PN2/1pP1k3/3N1b2/1qP3n1/4r3 w - - 0 1)

Perlsson, Avraham

To Mat, 1959

2B5/8/1pK4Q/4PN2/1pP1k3/3N1b2/1qP3n1/4r3

#2

8 + 7

15601 Albrecht-Leiss-Degener Collection 2024

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Sg3#
    • 1...Qxe5
      • 2.Sf2#
    • 1...Se3
      • 2.Qf4#
    • 1...Sf4
      • 2.Qxf4#
    • 1...Sh4
      • 2.Qf4#
  • Tries
    • 1.Kb7?
      • threat
        • 2.Qc6#
      • 1...Qxe5
        • 2.Sf2#
      • 1...Qd4
        • 2.Sg3#
      • 1...Se3
        • 2.Qf4#
      • 1...Sf4
        • 2.Qxf4#
      • 1...Qxc2!
  • Keys
    • 1.Qd6!
      • threat
        • 2.Qd5#
      • 1...Qxe5
        • 2.Qxe5#
      • 1...Qd4
        • 2.Qxd4#
      • 1...Se3
        • 2.Sg3#
      • 1...Sf4
        • 2.Sf2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • Q(b);SBLOCK::S(E)
    • Q(b);SBLOCK,XP(D)::S(B)
    • S(c);N_GUARD::QAR1(G)
    • S(c);N_GUARD::QAR1(G),XS(c)
  • Tries
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAB(G)
      • Vars
        • Q(b);SBLOCK,XP(D)::S(B)
        • Q(b);SBLOCK::S(E)
        • S(c);N_GUARD::QAR1(G)
        • S(c);N_GUARD::QAR1(G),XS(c)
      • Refutation
        • Q(b);XP(A)
  • Actual
    • Q(G);
    • Threat
      • QAB1(G)
    • Vars
      • Q(b);OGATE,XP(D)::QAR1(G),XQ(b)
      • Q(b);N_GUARD::QAR1(G),XQ(b)
      • S(c);SBLOCK::S(E)
      • S(c);SBLOCK::S(B)
HTML5 logo

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).