MESON Chess Problem Database

Problem Display
PID: 267063 (8/2N2p2/B7/4nK2/1B1kP3/p1n1p3/6Q1/8 w - - 0 1)

Castellari, Umberto

El Ajedrez Espanol, 1953

8/2N2p2/B7/4nK2/1B1kP3/p1n1p3/6Q1/8

#2

6 + 6

15601 Albrecht-Leiss-Degener Collection 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Sxe4
      • 2.Qxe4#
    • 1...e2
      • 2.Qg1#
      • 2.Qf2#
    • 1...f6
      • 2.Se6#
  • Tries
    • 1.Qd2+?
      • 1...Sd3
        • 2.Qxc3#
        • 2.Qxd3#
      • 1...exd2!
    • 1.Qg7?
      • threat
        • 2.Qxe5#
      • 1...e2
        • 2.Qg1#
      • 1...f6
        • 2.Se6#
      • 1...Sb5!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qxc3#
      • 1...Sxe4
        • 2.Qxe4#
      • 1...Sb1
        • 2.Sb5#
        • 2.Bc5#
        • 2.Qc5#
      • 1...Sd1
        • 2.Sb5#
        • 2.Bc5#
        • 2.Qc5#
      • 1...Sa2
        • 2.Sb5#
        • 2.Bc5#
        • 2.Qc5#
      • 1...Se2
        • 2.Sb5#
        • 2.Bc5#
        • 2.Qc5#
      • 1...Sa4
        • 2.Sb5#
      • 1...Sb5
        • 2.Sxb5#
        • 2.Bc5#
      • 1...Sd5
        • 2.Sb5#
        • 2.Bc5#
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • S(b);OGATE,XP(C)::QAR1(A),XS(b)
    • P(f);N_GUARD::S(F)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • P(c);XQ(A)
    • Try
      • Q(A);P_PINS(e)
      • Threat
        • QAB1(A),XS(e)
      • Vars
        • P(c);OGATEB::QAB(A)
        • P(f);N_GUARD,N_SPINS(e)::S(F)
      • Refutation
        • S(b);
  • Actual
    • Q(A);
    • Threat
      • QAB1(A),XS(b)
    • Vars
      • S(b);OGATE,XP(C)::QAR1(A),XS(b)
      • S(b);N_GUARD::S(F)
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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).