MESON Chess Problem Database

Problem Display
PID: 260778 (1K6/2p2n2/b1Q3N1/1p6/4P1p1/r6k/4NR1b/5n1R w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1928

1K6/2p2n2/b1Q3N1/1p6/4P1p1/r6k/4NR1b/5n1R

#2

7 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rg3
      • 2.Sef4#
    • 1...Sd2
      • 2.Rhxh2#
      • 2.Rfxh2#
    • 1...Se3
      • 2.Rhxh2#
      • 2.Rfxh2#
    • 1...Sg3
      • 2.Sg1#
      • 2.Sef4#
      • 2.Rhxh2#
      • 2.Rfxh2#
    • 1...g3
      • 2.Qd7#
      • 2.Qe6#
  • Tries
    • 1.Qf6?
      • threat
        • 2.Sgf4#
        • 2.Qh4#
      • 1...c5+
        • 2.Sgf4#
      • 1...c6+
        • 2.Sgf4#
      • 1...g3
        • 2.Qh4#
        • 2.Qf5#
        • 2.Qe6#
      • 1...Rf3
        • 2.Qh4#
      • 1...Sg5!
  • Keys
    • 1.Qxc7!
      • threat
        • 2.Sg1#
      • 1...g3
        • 2.Qd7#
      • 1...Rg3
        • 2.Sef4#
      • 1...Se5
        • 2.Qh7#
      • 1...Sd6
        • 2.Qh7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(c);SBLOCK::S(B)
  • Tries
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • P(h);CHECK::S(F)
        • R(c);::QAR1(E)
      • Refutation
        • S(i);
  • Actual
    • Q(E);P_SPINQ(E),XP(h)
    • Threat
      • S(B)
    • Vars
      • P(e);N_PINQ(E)::QAB(E)
      • R(c);N_PINQ(E),SBLOCK::S(B)
      • S(i);N_PINQ(E)::QAR(E)
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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).