MESON Chess Problem Database

Problem Display
PID: 243241 (1rk5/pp1p1p2/7n/r5R1/N1B2Q1B/8/6b1/2R3K1 w - - 0 1)

Svedberg, Erik Daniel

Tidskrift for Schack, 1980

1rk5/pp1p1p2/7n/r5R1/N1B2Q1B/8/6b1/2R3K1

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Kd8
      • 2.Rg8#
    • 1...Sg4
      • 2.Rg8#
    • 1...Sf5
      • 2.Rg8#
    • 1...Sg8
      • 2.Rxg8#
  • Tries
    • 1.Sb6+?
      • 1...Kd8
        • 2.Rg8#
      • 1...axb6!
    • 1.Bb5+?
      • 1...Kd8
        • 2.Rg8#
      • 1...Bc6!
    • 1.Bd5+?
      • 1...Kd8
        • 2.Rg8#
      • 1...Rc5!
  • Keys
    • 1.Re5!
      • threat
        • 2.Re8#
      • 1...Kc7
        • 2.Rc5#
      • 1...Rxe5
        • 2.Bd5#
      • 1...b5
        • 2.Bd5#
      • 1...b6
        • 2.Ba6#
      • 1...d5
        • 2.Bb5#
      • 1...d6
        • 2.Be6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 4
  • Sets
    • K(i);P-FLIGHT::B(F)+R(G),DCHECK
    • S(c);N_GUARD::R(G)
    • S(c);N_GUARD::R(G),XS(c)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(i);P-FLIGHT::B(F)+R(G),DCHECK
      • Refutation
        • P(d);XS(C)
    • Try
      • B(D);CHECK
      • Vars
        • K(i);P-FLIGHT::B(F)+R(G),DCHECK
      • Refutation
        • B(a);P_SPINB(a)
    • Try
      • B(D);CHECK
      • Vars
        • K(i);P-FLIGHT::B(F)+R(G),DCHECK
      • Refutation
        • R(b);P_SPINR(b)
  • Actual
    • R(G);
    • Threat
      • R(G)
    • Vars
      • K(i);P-FLIGHT::QAB(E)+R(G),DCHECK
      • R(b);N_GUARD,XR(G)::R(A)+B(D)
      • P(e);S_CUTR(b)::R(A)+B(D)
      • P(e);::R(A)+B(D),DCHECK
      • P(f);S_CUTB(a)::R(A)+B(D)
      • P(f);::R(A)+B(D),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).