MESON Chess Problem Database

Problem Display
PID: 204472 (n1kr3R/P1qN2R1/PrP5/1N2P3/4B2B/4K3/8/8 w - - 0 1)

Hochberger, Alfred

Ujsag, 1925

n1kr3R/P1qN2R1/PrP5/1N2P3/4B2B/4K3/8/8

#2

11 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Qxe5
      • 2.Rxd8#
    • 1...Qd6
      • 2.Rxd8#
    • 1...Qb8
      • 2.Rxd8#
    • 1...Qxc6
      • 2.Rxd8#
    • 1...Qxa7
      • 2.Rxd8#
    • 1...Qb7
      • 2.Rxd8#
    • 1...Qxd7
      • 2.cxd7#
  • Tries
    • 1.Sxb6+?
      • 1...Sxb6
        • 2.Rxc7#
      • 1...Qxb6+!
  • Keys
    • 1.Bf5!
      • threat
        • 2.Sxb6#
      • 1...Qxe5+
        • 2.Sxe5#
      • 1...Qxa7
        • 2.Rxd8#
      • 1...Qxd7
        • 2.Bxd7#
        • 2.Rxd8#
        • 2.cxd7#
      • 1...Rxb5
        • 2.Sb6#
      • 1...Rxa6
        • 2.Sb6#
      • 1...Rxc6
        • 2.Sb6#
      • 1...Rb7
        • 2.Sb6#
      • 1...Rb8
        • 2.Sb6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 5
    • REMOVED MATES = 5
  • Sets
    • Q(b);N_GUARD,P_PINB(B),XP(E)::R1(K),XR(e)
    • Q(b);N_GUARD::R1(K),XR(e)
    • Q(b);N_GUARD,XP(G)::R1(K),XR(e)
    • Q(b);N_GUARD,XP(H)::R1(K),XR(e)
    • Q(b);OGATE,XS(I)::P(G),XQ(b)
  • Tries
    • Try
      • S(I);CHECK,XR(a)
      • Vars
        • S(c);XS(I)::R1(J),XQ(b)
      • Refutation
        • Q(b);CHECK,XS(I)
  • Actual
    • B(B);
    • Threat
      • B(B)+S(I),DCHECK,XR(a)
    • Vars
      • Q(b);CHECK,XP(E)::B(B)+S(I),XQ(b)
      • Q(b);N_GUARD,XP(H)::R1(K),XR(e)
      • R(a);XS(D)::B(B)+S(I),DCHECK
      • R(a);XP(F)::B(B)+S(I),DCHECK
      • R(a);XP(G)::B(B)+S(I),DCHECK
      • R(a);::B(B)+S(I),DCHECK
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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).