MESON Chess Problem Database

Problem Display
PID: 64686 (n1NN2R1/P1k4p/Qb6/n2p4/3p3q/6RB/4p1pB/4Kb1r w - - 0 1)

Salai (Snr), Ladislav

2nd Prize, Pedagogusok Lapja, 1980

n1NN2R1/P1k4p/Qb6/n2p4/3p3q/6RB/4p1pB/4Kb1r

#2

9 + 12

6424 Czech Album (1979-1981) 1986
3752 FIDE Album (1980-1982) 1988
102 Probleemblad 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg3+
      • 2.Bxg3#
    • 1...Qg5
      • 2.Rc3#
    • 1...Qf6
      • 2.Rc3#
      • 2.R3g7#
    • 1...Qe7
      • 2.Rc3#
    • 1...Qxd8
      • 2.Rc3#
    • 1...Qxh3
      • 2.R3g7#
    • 1...Qe4
      • 2.Rc3#
      • 2.R3g7#
    • 1...Qf4
      • 2.R3g7#
    • 1...Qh5
      • 2.Rc3#
      • 2.R3g7#
    • 1...Qh6
      • 2.Rc3#
      • 2.R3g7#
    • 1...Bxa7
      • 2.Qd6#
    • 1...Sb3
      • 2.Qb7#
    • 1...Sc4
      • 2.Qb7#
    • 1...Sc6
      • 2.Qb7#
    • 1...Sb7
      • 2.Qxb7#
  • Keys
    • 1.Qb5!
      • threat
        • 2.Qd7#
      • 1...Qxg3+
        • 2.Bxg3#
      • 1...Qxd8
        • 2.R3g7#
      • 1...Qxh3
        • 2.Rc3#
      • 1...Bxa7
        • 2.Se6#
      • 1...Qg4
        • 2.Rc3#
      • 1...Qe7
        • 2.Rc3#
      • 1...Sc6
        • 2.Qxc6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 5
  • Sets
    • Q(f);CHECK,OGATE,P_SPINQ(f),XR(C)::B(B),XQ(f)
    • Q(f);N_PINR(C)::B(B)+R(C),DCHECK
    • Q(f);N_PINR(C),XS(H)::B(B)+R(C),DCHECK
    • Q(f);N_PINR(C),XB(D)::B(B)+R(C),DCHECK
    • Q(f);N_PINR(C)::R(C)
    • B(i);OGATE,XP(F)::QAB1(E)
    • S(g);N_GUARD::QAR1(E)
    • S(g);N_GUARD::QAR1(E),XS(g)
  • Actual
    • Q(E);
    • Threat
      • QAR1(E)
    • Vars
      • Q(f);CHECK,OGATE,P_SPINQ(f),XR(C)::B(B),XQ(f)
      • Q(f);N_PINR(C),XS(H)::B(B)+R(C),DCHECK
      • Q(f);N_PINR(C),XB(D)::B(B)+R(C),DCHECK
      • B(i);XP(F)::S(H)
      • Q(f);N_PINR(C)::B(B)+R(C),DCHECK
      • S(g);N_GUARD::QAR1(E),XS(g)
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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).