MESON Chess Problem Database

Problem Display
PID: 204555 (8/8/3p4/pK1P4/P1Pkpp2/3p4/1N1P4/B2Q2qr w - - 0 1)

Vallo, Istvan

Uj Nemezdek, 1925

8/8/3p4/pK1P4/P1Pkpp2/3p4/1N1P4/B2Q2qr

#2

8 + 8

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxd1
      • 2.Sxd1#
  • Tries
    • 1.Qf1?
      • threat
        • 2.Sd1#
        • 2.Sxd3#
      • 1...Qxf1
        • 2.Sd1#
      • 1...e3
        • 2.Qxf4#
      • 1...Ke5!
  • Keys
    • 1.Qg4!
      • threat
        • 2.Sd1#
      • 1...Ke5
        • 2.Sxd3#
      • 1...Qxa1
        • 2.Qg7#
      • 1...e3
        • 2.Qxf4#
      • 1...Qb1
        • 2.Qg7#
      • 1...Qc1
        • 2.Qg7#
      • 1...Qd1
        • 2.Sxd1#
        • 2.Qg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 1
  • Sets
    • Q(a);XQ(B)::B(A)+S(C),XQ(a)
  • Tries
    • Try
      • Q(B);
      • Threat
        • DUALS(2)
      • Vars
        • Q(a);XQ(B)::B(A)+S(C)
        • P(e);OGATEB::QAR2(B),XP(f)
      • Refutation
        • K(d);S_FLIGHT
  • Actual
    • Q(B);
    • Threat
      • B(A)+S(C)
    • Vars
      • K(d);S_FLIGHT::B(A)+S(C),DCHECK,XP(c)
      • Q(a);N_GUARD,XB(A)::QAB(B)
      • P(e);OGATEB,P_SPINP(f)::QAR2(B),XP(f)
      • Q(a);N_GUARD,P_PINS(C)::QAB(B)
      • Q(a);N_GUARD::QAB(B)
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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).