MESON Chess Problem Database

Problem Display
PID: 225410 (b7/4QNN1/r3r3/3pn1pB/2P1kP2/p1Pp2q1/K2B1p2/8 w - - 0 1)

Brabec, Juraj

Sturc, Jan

Praca, 1958

b7/4QNN1/r3r3/3pn1pB/2P1kP2/p1Pp2q1/K2B1p2/8

#2

9 + 11

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qh2
      • 2.Sxg5#
    • 1...Qf3
      • 2.Sxg5#
    • 1...Qh3
      • 2.Sxg5#
    • 1...Rb6
      • 2.Qxe5#
    • 1...Rc6
      • 2.Qxe5#
    • 1...Rd6
      • 2.Qxe5#
    • 1...Rf6
      • 2.Qxe5#
    • 1...Rg6
      • 2.Qxe5#
    • 1...Rh6
      • 2.Qxe5#
    • 1...Sf3
      • 2.Bg6#
    • 1...Sg4
      • 2.Sxg5#
    • 1...Sc6
      • 2.Sd6#
    • 1...g4
      • 2.Sg5#
  • Tries
    • 1.Sd6+?
      • 1...Rexd6
        • 2.Qxe5#
      • 1...Raxd6!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Qd4#
      • 1...Qe3
        • 2.Qxe3#
      • 1...Qg4
        • 2.Qe3#
      • 1...Sg4
        • 2.Sxg5#
      • 1...g4
        • 2.Sg5#
      • 1...Sf3
        • 2.Qe3#
      • 1...Sc6
        • 2.Qxd5#
      • 1...d4
        • 2.Qxd4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 3
    • REMOVED MATES = 9
  • Sets
    • Q(d);N_GUARD::S(H),XP(h)
    • R(j);OGATE,P_SPINS(g)::QAR1(G),XS(g)
    • S(g);N_GUARD,P_SPINR(j),SBLOCK::B(F)
    • S(g);P_SPINR(j),S_CUTQ(d)::S(H),XP(h)
    • S(g);P_SPINR(j),S_CUTR(i)::S(H)
    • P(h);S_CUTQ(d)::S(H)
  • Tries
    • Try
      • S(H);CHECK
      • Vars
        • R(j);OGATE,P_SPINS(g),XS(H)::QAR1(G),XS(g)
      • Refutation
        • R(i);XS(H)
  • Actual
    • Q(G);
    • Threat
      • QAR1(G)
    • Vars
      • Q(d);N_GUARD::QAR1(G),XQ(d)
      • Q(d);N_GUARD::QAR1(G)
      • S(g);S_CUTQ(d)::S(H),XP(h)
      • P(h);S_CUTQ(d)::S(H)
      • S(g);S_CUTQ(d)::QAR1(G)
      • S(g);S_CUTB(k)::QAB1(G),XP(f)
      • P(f);::QAR1(G),XP(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).