MESON Chess Problem Database

Problem Display
PID: 110808 (8/8/8/8/2p2KN1/5n1N/1Q4R1/r4n1k w - - 0 1)

Palkoska, Emil

Checkmate, 1903

8/8/8/8/2p2KN1/5n1N/1Q4R1/r4n1k

#2

5 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Se1
      • 2.Rg1#
    • 1...Sg1
      • 2.Rxg1#
    • 1...Sd2
      • 2.Rg1#
    • 1...Sh2
      • 2.Rg1#
    • 1...Sd4
      • 2.Rg1#
    • 1...Sh4
      • 2.Rg1#
    • 1...Se5
      • 2.Rg1#
    • 1...Sg5
      • 2.Rg1#
  • Tries
    • 1.Rg3?
      • threat
        • 2.Shf2#
        • 2.Qg2#
      • 1...Ra2
        • 2.Shf2#
      • 1...S1d2
        • 2.Shf2#
      • 1...Se3
        • 2.Shf2#
      • 1...Se1
        • 2.Shf2#
        • 2.Rg1#
      • 1...S3d2
        • 2.Shf2#
        • 2.Rg1#
      • 1...Sh4
        • 2.Shf2#
        • 2.Rg1#
      • 1...Sxg3!
  • Keys
    • 1.Qb7!
      • threat
        • 2.Rg1#
      • 1...Kxg2
        • 2.Qxf3#
      • 1...S1d2
        • 2.Rh2#
      • 1...S1h2
        • 2.Rxh2#
      • 1...Se3
        • 2.Rh2#
      • 1...Sg3
        • 2.Rh2#
      • 1...Sg1
        • 2.Shf2#
        • 2.Sgf2#
        • 2.Rxg1#
        • 2.Rh2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 8
  • Sets
    • S(d);N_GUARD::R1(B)
    • S(d);N_GUARD::R1(B),XS(d)
  • Tries
    • Try
      • R(B);
      • Threat
        • DUALS(2)
      • Vars
        • R(a);::S(C)
        • S(b);::S(C)
      • Refutation
        • S(b);XR(B)
  • Actual
    • Q(A);
    • Threat
      • R1(B)
    • Vars
      • K(c);OGATEB,P_SPINS(d),S_FLIGHT,XR(B)::QAB1(A),XS(d)
      • S(b);N_GUARD::R1(B)
      • S(b);N_GUARD::R1(B),XS(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).