MESON Chess Problem Database

Problem Display
PID: 121463 (8/Npn5/PPP5/k1P5/p2Q4/8/3K4/8 w - - 0 1)

Dehler, Ernst Georg

Rigaer Tageblatt, 1913

8/Npn5/PPP5/k1P5/p2Q4/8/3K4/8

#2

7 + 4

6490 yacpdb 2009
15148 Sadier Collection 2014

SOLUTION

  • SOUND
  • Sets
    • 1...Kxa6
      • 2.Qxa4#
    • 1...bxa6
      • 2.Qc3#
  • Tries
    • 1.Qb4+?
      • 1...Kxa6
        • 2.Qxa4#
      • 1...Kxb4!
    • 1.Qc4?
      • 1...Sxa6
        • 2.Qb5#
      • 1...bxa6
        • 2.Qc3#
      • 1...bxc6
        • 2.Sxc6#
      • 1...Sb5
        • 2.Qxb5#
      • 1...Sd5
        • 2.Qb5#
      • 1...Se6
        • 2.Qb5#
      • 1...Sa8
        • 2.Qb5#
      • 1...Se8
        • 2.Qb5#
      • 1...a3!
  • Keys
    • 1.Qd3!
      • 1...Kb4
        • 2.Qc3#
      • 1...Sxa6
        • 2.Qb5#
      • 1...bxa6
        • 2.Qc3#
      • 1...bxc6
        • 2.Sxc6#
      • 1...Sb5
        • 2.Qxb5#
      • 1...a3
        • 2.Qxa3#
      • 1...Sd5
        • 2.Qb5#
      • 1...Se6
        • 2.Qb5#
      • 1...Sa8
        • 2.Qb5#
      • 1...Se8
        • 2.Qb5#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • K(b);P-FLIGHT,XP(D)::QAR2(B),XP(a)
    • P(c);SBLOCK,XP(D)::QAB(B)
  • Tries
    • Try
      • Q(B);CHECK
      • Vars
        • K(b);P-FLIGHT,XP(D)::QAR2(B),XP(a)
      • Refutation
        • K(b);S_FLIGHT,XQ(B)
    • Try
      • Q(B);
      • Vars
        • S(d);N_GUARD,XP(D)::QAR1(B)
        • P(c);SBLOCK,XP(D)::QAB(B)
        • P(c);XP(F)::S(G),XP(c)
        • S(d);N_GUARD::QAR1(B),XS(d)
        • S(d);N_GUARD::QAR1(B)
      • Refutation
        • P(a);
  • Actual
    • Q(B);
    • Vars
      • K(b);S_FLIGHT::QAB1(B)
      • S(d);N_GUARD,XP(D)::QAR1(B)
      • P(c);SBLOCK,XP(D)::QAB(B)
      • P(c);XP(F)::S(G),XP(c)
      • S(d);N_GUARD::QAR1(B),XS(d)
      • P(a);OGATEB::QAR2(B),XP(a)
      • S(d);N_GUARD::QAR1(B)
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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).