MESON Chess Problem Database

Problem Display
PID: 264194 (1r1R4/4Q3/3BP3/bP1kN3/6RK/1P2pPp1/1Pnrn1N1/8 w - - 0 1)

Hjelle, David

Karlstrom, Alfred Olaf

Tijdschrift vd KNSB, 1946

1r1R4/4Q3/3BP3/bP1kN3/6RK/1P2pPp1/1Pnrn1N1/8

#2

12 + 8

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rxb5
      • 2.Bc7#
    • 1...Rb7
      • 2.Bc7#
    • 1...Bc3
      • 2.Bxb8#
    • 1...Sa1
      • 2.Sxe3#
    • 1...Se1
      • 2.Sxe3#
    • 1...Sa3
      • 2.Sxe3#
    • 1...Sb4
      • 2.Sxe3#
    • 1...Scd4
      • 2.Sxe3#
    • 1...Sed4
      • 2.Sf4#
  • Tries
    • 1.Sf4+?
      • 1...Kd4
        • 2.Sc6#
      • 1...Sxf4!
    • 1.Qb7+?
      • 1...Kxe6
        • 2.Qf7#
      • 1...Rxb7!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Sc6#
      • 1...Rd4+
        • 2.Sg4#
      • 1...Kd4
        • 2.Bc5#
      • 1...Rxb5
        • 2.Bc7#
      • 1...Bc3
        • 2.Bxb8#
      • 1...Scd4
        • 2.Sxe3#
      • 1...Sed4
        • 2.Sf4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(h);N_GUARD,XP(G)::R(L)+B(I)
    • R(h);N_GUARD::R(L)+B(I)
    • B(f);N_GUARD::R(L)+B(I),XR(h)
    • S(a);N_GUARD::S(B),XP(d)
    • S(c);N_GUARD,SBLOCK::S(B)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(g);P-FLIGHT,S_CUTS(c)::S(H)
      • Refutation
        • S(c);XS(B)
    • Try
      • Q(K);CHECK
      • Vars
        • K(g);OGATEB,S_FLIGHT,XP(J)::QAB1(K)
      • Refutation
        • R(h);XQ(K)
  • Actual
    • R(E);
    • Threat
      • R(E)+S(H)
    • Vars
      • R(b);CHECK,SBLOCK::R(E)+S(H)
      • K(g);P-FLIGHT::R(L)+B(I),DCHECK
      • R(h);N_GUARD,XP(G)::R(L)+B(I)
      • B(f);N_GUARD::R(L)+B(I),XR(h)
      • S(a);N_GUARD,SBLOCK::S(B),XP(d)
      • S(c);N_GUARD,SBLOCK::S(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).