MESON Chess Problem Database

Problem Display
PID: 266815 (3R1B2/3n4/3Q2B1/1Kprr1n1/2Pk4/5bN1/3PP3/8 w - - 0 1)

Castellari, Umberto

L'Italia Scacchistica, 1950

3R1B2/3n4/3Q2B1/1Kprr1n1/2Pk4/5bN1/3PP3/8

#2

9 + 7

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Re4
      • 2.Sf5#
      • 2.Qxd5#
    • 1...Sb6
      • 2.Qxc5#
    • 1...Sf6
      • 2.Qxc5#
    • 1...Sb8
      • 2.Qxc5#
    • 1...Sxf8
      • 2.Qxc5#
  • Tries
    • 1.Bg7?
      • threat
        • 2.e3#
      • 1...Bxe2
        • 2.Sxe2#
        • 2.Qxd5#
      • 1...Se4
        • 2.Sf5#
        • 2.Qxd5#
      • 1...Sf6
        • 2.Qxc5#
      • 1...Be4!
    • 1.Qxc5+?
      • 1...Sxc5
        • 2.Bxc5#
      • 1...Rxc5+!
  • Keys
    • 1.Qf6!
      • threat
        • 2.e3#
      • 1...Bxe2
        • 2.Sxe2#
      • 1...Sxf6
        • 2.Bxc5#
      • 1...Be4
        • 2.Qf2#
      • 1...Se4
        • 2.Sf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • S(g);N_GUARD::QAB1(F),XP(c)
    • S(g);N_GUARD,XB(I)::QAB1(F),XP(c)
  • Tries
    • Try
      • B(I);
      • Threat
        • P(B)
      • Vars
        • S(g);N_GUARD::QAB1(F),XP(c)
      • Refutation
        • B(a);
    • Try
      • Q(F);CHECK,N_PINR(d),P_SPINQ(F),XP(c)
      • Vars
        • S(g);OGATE,P_SPINR(d),XQ(F)::B(I),XS(g)
      • Refutation
        • R(d);CHECK,P_SPINS(g),XQ(F)
  • Actual
    • Q(F);N_PINR(d),P_PINR(e)
    • Threat
      • P(B)
    • Vars
      • B(a);P_PINP(D),XP(B)::S(C),XB(a)
      • S(g);N_GUARD,N_SPINR(e),P_SPINR(d),XQ(F)::B(I),XP(c)
      • B(a);OGATE::QAB(F)
      • S(f);SBLOCK::S(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).