MESON Chess Problem Database

Problem Display
PID: 83772 (8/8/8/4p1P1/5B1k/K3Qn1r/3p1NRp/3B2b1 w - - 0 1)

Ellerman, Arnoldo

Die Schwalbe, 1960

8/8/8/4p1P1/5B1k/K3Qn1r/3p1NRp/3B2b1

#2

7 + 7

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Qxh3#
    • 1...Sd4
      • 2.Qxh3#
    • 1...Sxg5
      • 2.Bxg5#
  • Tries
    • 1.Qd3?
      • threat
        • 2.Qh7#
      • 1...Kh5
        • 2.Qh7#
      • 1...Sxg5
        • 2.Bxg5#
      • 1...Se1
        • 2.Qxh3#
      • 1...Sd4
        • 2.Qxh3#
      • 1...e4!
  • Keys
    • 1.Qe4!
      • threat
        • 2.Qh7#
      • 1...Se1+
        • 2.Be3#
      • 1...Sd4+
        • 2.Be3#
      • 1...Sxg5+
        • 2.Bg3#
      • 1...Kh5
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • S(d);OGATE,P_PINQ(E)::QAR1(E),XR(e)
    • S(d);OGATE,P_PINQ(E),XP(G)::B(F),XS(d)
  • Tries
    • Try
      • Q(E);
      • Threat
        • QAR(E)
      • Vars
        • K(f);P-FLIGHT,P_SPINS(d)::QAR2(E)
        • S(d);OGATE,P_PINQ(E),XP(G)::B(F),XS(d)
        • S(d);OGATE,P_PINQ(E)::QAR1(E),XR(e)
      • Refutation
        • P(g);
  • Actual
    • Q(E);
    • Threat
      • QAR(E)
    • Vars
      • S(d);CHECK::QAR(E)+B(F)
      • S(d);CHECK,SBLOCK,XP(G)::QAR(E)+B(F),DCHECK
      • K(f);P-FLIGHT,P_SPINS(d)::QAR2(E)
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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).