MESON Chess Problem Database

Problem Display
PID: 259609 (8/2nK4/2Q5/1Pp5/b1kN4/4P3/N1P1R3/8 w - - 0 1)

Somma, Francesco

L'Echiquier, 1925

8/2nK4/2Q5/1Pp5/b1kN4/4P3/N1P1R3/8

#2

8 + 4

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb5
      • 2.Qe6#
    • 1...Sa6
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
    • 1...Sa8
      • 2.Qe6#
    • 1...Se8
      • 2.Qe6#
  • Tries
    • 1.Sb3?
      • threat
        • 2.Sd2#
        • 2.Sa5#
        • 2.Qxc5#
      • 1...Bxb5
        • 2.Sd2#
        • 2.Sa5#
      • 1...Sa6
        • 2.Sd2#
        • 2.Sa5#
      • 1...Se6
        • 2.Sd2#
        • 2.Sa5#
      • 1...Bxb3!
  • Keys
    • 1.Qe4!
      • 1...Bxb5+
        • 2.Sc6#
      • 1...Bxc2
        • 2.Rxc2#
      • 1...Sxb5
        • 2.Qe6#
      • 1...cxd4
        • 2.Qc6#
      • 1...Bb3
        • 2.cxb3#
      • 1...Sd5
        • 2.Qd3#
      • 1...Sa6
        • 2.Qe6#
      • 1...Se6
        • 2.Qxe6#
      • 1...Sa8
        • 2.Qe6#
      • 1...Se8
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 0
  • Sets
    • S(d);N_GUARD,XP(F)::QAB(G)
    • S(d);N_GUARD::QAB(G)
    • S(d);N_GUARD::QAB(G),XS(d)
  • Tries
    • Try
      • S(E);
      • Threat
        • DUALS(3)
      • Refutation
        • B(a);XS(E)
  • Actual
    • Q(G);N_PINP(c),P_SPINP(F)
    • Vars
      • B(a);CHECK,SBLOCK,XP(F)::QAR(G)+S(E)
      • B(a);N_PINP(F),OGATE,XP(B)::R(C),XB(a)
      • S(d);N_GUARD,XP(F)::QAB(G)
      • P(c);OGATEB,P_SPINP(c),XS(E)::QAR2(G)
      • B(a);N_PINP(F),OGATE::P(B),XB(a)
      • S(d);SBLOCK::QAB1(G)
      • S(d);N_GUARD::QAB(G)
      • S(d);N_GUARD::QAB(G),XS(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).