MESON Chess Problem Database

Problem Display
PID: 197922 (6Q1/3N4/4Bp2/2P2P1p/3k4/1ppppP2/8/6K1 w - - 0 1)

Popov, Mikhail Nikolov

Stella Polaris, 1966

6Q1/3N4/4Bp2/2P2P1p/3k4/1ppppP2/8/6K1

#2

7 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...h4
      • 2.Qg4#
  • Tries
    • 1.Bxb3?
      • threat
        • 2.Qc4#
        • 2.Qd5#
      • 1...c2
        • 2.Qc4#
      • 1...e2!
    • 1.Qg3?
      • threat
        • 2.Qf4#
        • 2.Qh4#
        • 2.Qd6#
      • 1...d2
        • 2.Qd6#
      • 1...e2
        • 2.Qf2#
        • 2.Qf4#
      • 1...h4
        • 2.Qf4#
        • 2.Qxh4#
        • 2.Qd6#
        • 2.Qg4#
      • 1...c2!
    • 1.Qa8?
      • threat
        • 2.Qe4#
        • 2.Qd5#
        • 2.Qa4#
      • 1...d2
        • 2.Qe4#
        • 2.Qd5#
      • 1...e2
        • 2.Qe4#
      • 1...c2!
    • 1.Qf8?
      • threat
        • 2.Qd6#
        • 2.Qxf6#
      • 1...c2
        • 2.Qxf6#
      • 1...d2
        • 2.Qd6#
      • 1...e2!
  • Keys
    • 1.Qb8!
      • threat
        • 2.Qf4#
        • 2.Qd6#
        • 2.Qb4#
      • 1...c2
        • 2.Qb4#
      • 1...d2
        • 2.Qd6#
      • 1...e2
        • 2.Qf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(f);N_GUARD::QAR(G)
  • Tries
    • Try
      • B(E);XP(a)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAR1(G)
      • Refutation
        • P(d);
    • Try
      • Q(G);
      • Threat
        • DUALS(3)
      • Vars
        • P(c);::QAR2(G)
      • Refutation
        • P(b);
    • Try
      • Q(G);
      • Threat
        • DUALS(3)
      • Vars
        • P(d);::QAR1(G)
      • Refutation
        • P(b);
    • Try
      • Q(G);
      • Threat
        • DUALS(2)
      • Vars
        • P(b);::QAB(G),XP(g)
        • P(c);::QAR2(G)
      • Refutation
        • P(d);
  • Actual
    • Q(G);
    • Threat
      • DUALS(3)
    • Vars
      • P(b);::QAR2(G)
      • P(c);::QAR2(G)
      • P(d);::QAR2(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).