MESON Chess Problem Database

Problem Display
PID: 80422 (Bb2rNQ1/1q6/2r4p/4p2K/3P2R1/5k1N/7n/4R2n w - - 0 1)

Kovacs, Florian Janos

Good Companions (November), 1923

Bb2rNQ1/1q6/2r4p/4p2K/3P2R1/5k1N/7n/4R2n

#2

8 + 9

3391 Het Half Pin Thema 1924
3530 Het Half Pin Thema (II) 1947

SOLUTION

  • SOUND
  • Sets
    • 1...Qa6
      • 2.Qf7#
    • 1...Qc8
      • 2.Qb3#
    • 1...Qb2
      • 2.Qf7#
    • 1...Qb3
      • 2.Qxb3#
    • 1...Qb4
      • 2.Qf7#
    • 1...Qb5
      • 2.Qf7#
    • 1...Qb6
      • 2.Qf7#
    • 1...Qa7
      • 2.Qb3#
    • 1...Qc7
      • 2.Qb3#
    • 1...Qd7
      • 2.Qb3#
    • 1...Qe7
      • 2.Qb3#
    • 1...Qf7+
      • 2.Qxf7#
    • 1...Qg7
      • 2.Qb3#
    • 1...Rc1
      • 2.Qf7#
    • 1...Rc2
      • 2.Qf7#
    • 1...Rc3
      • 2.Qf7#
    • 1...Rc4
      • 2.Qf7#
    • 1...Rc5
      • 2.Qf7#
    • 1...Ra6
      • 2.Qb3#
    • 1...Rd6
      • 2.Qb3#
    • 1...Rf6
      • 2.Qb3#
    • 1...Rg6
      • 2.Qb3#
    • 1...Rcc8
      • 2.Qf7#
    • 1...Sf2
      • 2.Sg1#
      • 2.Rg3#
    • 1...Sg3+
      • 2.Rxg3#
    • 1...Sxg4
      • 2.Qxg4#
  • Tries
    • 1.Qb3+?
      • 1...Rc3
        • 2.Qd1#
        • 2.Qf7#
        • 2.Qxc3#
      • 1...Qxb3!
    • 1.Qf7+?
      • 1...Rf6
        • 2.Qb3#
        • 2.Qxf6#
      • 1...Qxf7+!
  • Keys
    • 1.Rgg1!
      • threat
        • 2.Qg2#
      • 1...Qf7+
        • 2.Qxf7#
      • 1...Sg3+
        • 2.Rxg3#
        • 2.Qxg3#
      • 1...Qb2
        • 2.Qf7#
      • 1...Qg7
        • 2.Qb3#
      • 1...Rc2
        • 2.Qf7#
      • 1...Rg6
        • 2.Qb3#
      • 1...Sg4
        • 2.Qxg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 19
  • Sets
    • Q(g);N_GUARD,P_SPINR(e)::QAR(H)
    • Q(g);N_GUARD,P_SPINR(e)::QAR(H),XQ(g)
    • Q(g);CHECK,N_GUARD,P_SPINR(e)::QAR(H),XQ(g)
    • R(e);N_GUARD,P_SPINQ(g)::QAR(H)
    • S(a);CHECK,N_GUARD::R1(D),XS(a)
    • S(b);OGATE,XR(D)::QAB1(H),XS(b)
  • Tries
    • Try
      • Q(H);CHECK
      • Refutation
        • Q(g);P_SPINR(e),XQ(H)
    • Try
      • Q(H);CHECK
      • Refutation
        • Q(g);CHECK,P_SPINR(e),XQ(H)
  • Actual
    • R(D);
    • Threat
      • QAB1(H)
    • Vars
      • Q(g);CHECK,N_GUARD,P_SPINR(e)::QAR(H),XQ(g)
      • Q(g);N_GUARD,P_SPINR(e)::QAR(H)
      • R(e);N_GUARD,P_SPINQ(g)::QAR(H)
      • S(b);N_GUARD::QAB1(H),XS(b)
HTML5 logo

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).