MESON Chess Problem Database

Problem Display
PID: 108482 (8/8/8/8/4N3/5Qp1/6Pq/5K1k w - - 0 1)

Jakubowski, Grzegorz

Biuletyn Cz OZSZ, 1988

8/8/8/8/4N3/5Qp1/6Pq/5K1k

#2

4 + 3

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qxg2+
      • 2.Qxg2#
    • 1...Qh5
      • 2.Qxh5#
  • Tries
    • 1.Qh5?
      • threat
        • 2.Sxg3#
      • 1...Qh3
        • 2.Qxh3#
      • 1...Qh4
        • 2.Qxh4#
      • 1...Qxh5!
    • 1.Qe3?
      • 1...Qg1+
        • 2.Qxg1#
      • 1...Qh3
        • 2.Qg1#
      • 1...Qh4
        • 2.Qg1#
      • 1...Qh5
        • 2.Qg1#
      • 1...Qh6
        • 2.Qg1#
        • 2.Qxh6#
      • 1...Qh7
        • 2.Qg1#
      • 1...Qh8
        • 2.Qg1#
      • 1...Qxg2+!
  • Keys
    • 1.Qf2!
      • 1...Qg1+
        • 2.Qxg1#
      • 1...Qxg2+
        • 2.Qxg2#
      • 1...gxf2
        • 2.Sxf2#
      • 1...Qh3
        • 2.Qg1#
      • 1...Qh4
        • 2.Qg1#
      • 1...Qh5
        • 2.Qg1#
      • 1...Qh6
        • 2.Qg1#
      • 1...Qh7
        • 2.Qg1#
      • 1...Qh8
        • 2.Qg1#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 7
    • REMOVED MATES = 0
  • Sets
    • Q(b);CHECK,OGATE,P_SPINQ(b),XP(B)::QAB1(C),XQ(b)
    • Q(b);OGATEB::QAR(C),XQ(b)
  • Tries
    • Try
      • Q(C);P_PINQ(b)
      • Threat
        • S(D),XP(c)
      • Vars
        • Q(b);OGATEB,P_PINP(B)::QAR2(C),XQ(b)
        • Q(b);OGATEB::QAR(C),XQ(b)
      • Refutation
        • Q(b);N_SPINQ(b),XQ(C)
    • Try
      • Q(C);
      • Vars
        • Q(b);CHECK,N_GUARD::QAR1(C),XQ(b)
        • Q(b);N_GUARD,P_PINP(B)::QAR1(C)
        • Q(b);N_GUARD::QAR1(C)
      • Refutation
        • Q(b);CHECK,XP(B)
  • Actual
    • Q(C);
    • Vars
      • Q(b);CHECK,N_GUARD::QAR1(C),XQ(b)
      • Q(b);CHECK,OGATE,XP(B)::QAB1(C),XQ(b)
      • P(c);XQ(C)::S(D),XP(c)
      • Q(b);N_GUARD,P_PINP(B)::QAR1(C)
      • Q(b);N_GUARD::QAR1(C)
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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).