MESON Chess Problem Database

Problem Display
PID: 188511 (3n4/2pBp3/3p1p1b/3k1pR1/N4n2/3P4/PQ1KbRp1/8 w - - 0 1)

Vinje, Oskar E

The Observer, 1937

(First published on Sun Jul 25 1937)

3n4/2pBp3/3p1p1b/3k1pR1/N4n2/3P4/PQ1KbRp1/8

#2

8 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Sfe6
      • 2.Rxf5#
    • 1...Sde6
      • 2.Rxf5#
    • 1...c5
      • 2.Sb6#
  • Tries
    • 1.Sb6+?
      • 1...Kc5
        • 2.d4#
      • 1...cxb6!
    • 1.Qb5+?
      • 1...Kd4
        • 2.Rxf4#
      • 1...c5!
  • Keys
    • 1.Ke3!
      • threat
        • 2.Qd4#
      • 1...Sfe6
        • 2.Rxf5#
      • 1...Sc6
        • 2.Qb5#
      • 1...Sde6
        • 2.Rxf5#
      • 1...c5
        • 2.Sb6#
      • 1...e5
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE,P_PINR(G)::R(D),XP(e)
    • S(k);S_CUTP(j)::R(G),XP(e)
    • P(i);N_GUARD,SBLOCK::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Vars
        • K(d);P-FLIGHT::P(E)
      • Refutation
        • P(i);XS(F)
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);N_SPINP(e),P-FLIGHT::R(D),XS(c)
      • Refutation
        • P(i);N_SPINP(e),P_SPINP(i)
  • Actual
    • K(C);S_FLIGHT
    • Threat
      • QAR1(B)
    • Vars
      • S(c);OGATE,P_PINR(G)::R(D),XP(e)
      • S(k);S_CUTP(i)::QAR2(B)
      • S(k);S_CUTP(j)::R(G),XP(e)
      • P(i);N_GUARD,SBLOCK::S(F)
      • P(j);N_SPINP(e),SBLOCK::QAB(B)
HTML5 logo

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).