MESON Chess Problem Database

Problem Display
PID: 200662 (8/4N2K/8/2r2pp1/3Pkn2/2Pp1pQ1/3B1p1p/6qN w - - 0 1)

Riczu, Lajos

Stella Polaris, 1967

8/4N2K/8/2r2pp1/3Pkn2/2Pp1pQ1/3B1p1p/6qN

#2

7 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qa1
      • 2.Sxf2#
    • 1...Qb1
      • 2.Sxf2#
    • 1...Qc1
      • 2.Sxf2#
    • 1...Qd1
      • 2.Sxf2#
    • 1...Qxg3
      • 2.Sxg3#
    • 1...Sd5
      • 2.Qe5#
    • 1...g4
      • 2.Qxf4#
  • Keys
    • 1.Qxg5!
      • threat
        • 2.Qxf4#
      • 1...Qxg5
        • 2.Sxf2#
      • 1...Qg3
        • 2.Sxg3#
      • 1...Qg4
        • 2.Sxf2#
      • 1...Se2
        • 2.Qe3#
      • 1...Sg2
        • 2.Sg3#
      • 1...Sh3
        • 2.Qe3#
      • 1...Sd5
        • 2.Qxf5#
      • 1...Sh5
        • 2.Qe3#
      • 1...Se6
        • 2.Qe3#
      • 1...Sg6
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 5
  • Sets
    • Q(a);N_GUARD::S(A),XP(b)
    • Q(a);XQ(D)::S(A),XQ(a)
    • S(g);OGATE::QAR1(D)
    • P(j);N_GUARD::QAR1(D),XS(g)
  • Actual
    • Q(D);XP(j)
    • Threat
      • QAR1(D),XS(g)
    • Vars
      • Q(a);N_GUARD,XQ(D)::S(A),XP(b)
      • Q(a);N_GUARD::S(A),XQ(a)
      • Q(a);N_GUARD::S(A),XP(b)
      • S(g);OGATE::QAR1(D)
      • S(g);S_CUTQ(a)::S(A)
      • S(g);S_CUTR(h)::QAB1(D),XP(i)
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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).