MESON Chess Problem Database

Problem Display
PID: 100755 (7q/5Bn1/4N1PN/r6k/2p5/p1K5/2nQ1B2/r7 w - - 0 1)

Drnek, Josef

Narodni Politika, 1918

7q/5Bn1/4N1PN/r6k/2p5/p1K5/2nQ1B2/r7

#2

7 + 8

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxh6
      • 2.Qe2#
    • 1...Qh7
      • 2.gxh7#
    • 1...Qa8
      • 2.Sxg7#
    • 1...Qb8
      • 2.Sxg7#
    • 1...Qc8
      • 2.Sxg7#
    • 1...Qd8
      • 2.Sxg7#
    • 1...Qe8
      • 2.Sxg7#
    • 1...Ra4
      • 2.Qg5#
    • 1...Rg5
      • 2.Qxg5#
    • 1...Ra6
      • 2.Qg5#
    • 1...Ra7
      • 2.Qg5#
    • 1...Ra8
      • 2.Qg5#
    • 1...Sf5+
      • 2.g7#
    • 1...Sxe6+
      • 2.g7#
    • 1...Se8+
      • 2.g7#
  • Tries
    • 1.Bg3?
      • threat
        • 2.Qh2#
      • 1...Sf5+
        • 2.g7#
      • 1...Sxe6+
        • 2.g7#
      • 1...Se8+
        • 2.g7#
      • 1...Qxh6
        • 2.Qe2#
      • 1...Qd8
        • 2.Sxg7#
      • 1...Rh1!
    • 1.Qf4?
      • threat
        • 2.Qh2#
        • 2.Qh4#
      • 1...Sf5+
        • 2.g7#
      • 1...Sxe6+
        • 2.g7#
      • 1...Se8+
        • 2.g7#
      • 1...Qxh6
        • 2.Qf3#
        • 2.Qh4#
      • 1...Qb8
        • 2.Sxg7#
        • 2.Qh4#
      • 1...Qd8
        • 2.Sxg7#
      • 1...Rh1!
  • Keys
    • 1.Be1!
      • threat
        • 2.Qh2#
      • 1...Sf5+
        • 2.g7#
      • 1...Sxe6+
        • 2.g7#
      • 1...Se8+
        • 2.g7#
      • 1...Qxh6
        • 2.Qe2#
      • 1...Qb8
        • 2.Sxg7#
      • 1...Qd8
        • 2.Sxg7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 9
  • Sets
    • Q(h);SBLOCK,XS(F)::QAB(A)
    • Q(h);OGATE::B(G)+P(E),XQ(h)
    • Q(h);N_GUARD::S(D),XS(g)
    • R(e);N_GUARD::QAR1(A)
    • R(e);N_GUARD::QAR1(A),XR(e)
    • R(e);N_GUARD,SBLOCK::QAR1(A)
    • S(g);CHECK,OGATE::B(G)+P(E)
    • S(g);CHECK,OGATE,XS(D)::B(G)+P(E)
  • Tries
    • Try
      • B(B);
      • Threat
        • QAR(A)
      • Vars
        • S(g);CHECK,OGATE::B(G)+P(E)
        • S(g);CHECK,OGATE,XS(D)::B(G)+P(E)
        • Q(h);SBLOCK,XS(F)::QAB(A)
        • Q(h);N_GUARD::S(D),XS(g)
      • Refutation
        • R(a);
    • Try
      • Q(A);
      • Threat
        • DUALS(2)
      • Vars
        • S(g);CHECK,OGATE::B(G)+P(E)
        • S(g);CHECK,OGATE,XS(D)::B(G)+P(E)
        • Q(h);N_GUARD::S(D),XS(g)
      • Refutation
        • R(a);
  • Actual
    • B(B);
    • Threat
      • QAR(A)
    • Vars
      • S(g);CHECK,OGATE::B(G)+P(E)
      • S(g);CHECK,OGATE,XS(D)::B(G)+P(E)
      • Q(h);SBLOCK,XS(F)::QAB(A)
      • Q(h);N_GUARD::S(D),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).