MESON Chess Problem Database

Problem Display
PID: 120000 (8/3K4/5p2/3pk3/1P6/3Pp1P1/4P3/2Q5 w - - 0 1)

Prokes, Ladislav

Sokolske besedy, 1929

8/3K4/5p2/3pk3/1P6/3Pp1P1/4P3/2Q5

#2

6 + 4

6490 yacpdb 2009
5454 Near Snap 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Kd4
      • 2.Qb2#
      • 2.Qa1#
    • 1...d4
      • 2.Qc5#
  • Tries
    • 1.Ke7?
      • 1...Kd4
        • 2.Qb2#
        • 2.Qa1#
      • 1...d4
        • 2.Qc5#
      • 1...f5
        • 2.Qxe3#
      • 1...Kf5!
    • 1.Qa1+?
      • 1...d4
        • 2.Qa5#
      • 1...Kf5!
    • 1.Qc3+?
      • 1...d4
        • 2.Qc5#
      • 1...Kf5!
  • Keys
    • 1.Qh1!
      • 1...Kd4
        • 2.Qa1#
      • 1...Kf5
        • 2.Qh5#
      • 1...d4
        • 2.Qe4#
      • 1...f5
        • 2.Qh8#

Anticipated by 17132(1902)

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • P(b);OGATEB::QAR2(A)
  • Tries
    • Try
      • K(F);P-FLIGHT
      • Vars
        • P(b);OGATEB::QAR2(A)
        • P(d);SBLOCK::QAR2(A),XP(a)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • P(b);OGATEB,P_SPINP(b),SBLOCK::QAR(A)
      • Refutation
        • K(c);P-FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • P(b);OGATEB,P_SPINP(b)::QAR2(A)
      • Refutation
        • K(c);P-FLIGHT
  • Actual
    • Q(A);
    • Vars
      • K(c);S_FLIGHT::QAB(A)
      • K(c);P-FLIGHT::QAR2(A)
      • P(b);N_GUARD::QAR1(A)
      • P(d);OGATEB,SBLOCK::QAB(A)
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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).