MESON Chess Problem Database

Problem Display
PID: 205812 (r2r4/2P5/P3Pn2/R1Nk4/1B3P2/2R2P2/2N5/2nK4 w - - 0 1)

Dahlberg, Frank

Schackvarlden, 1925

r2r4/2P5/P3Pn2/R1Nk4/1B3P2/2R2P2/2N5/2nK4

#2

11 + 5

6490 yacpdb 2020

SOLUTION

  • SOUND
  • Sets
    • 1...Kc6+
      • 2.Sd7#
  • Tries
    • 1.cxd8Q+?
      • 1...Kc6
        • 2.Sd4#
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sb7#
        • 2.Sd7#
      • 1...Sd7
        • 2.Qxd7#
      • 1...Rxd8!
  • Keys
    • 1.f5!
      • threat
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sb7#
        • 2.Sd7#
      • 1...Ke5+
        • 2.Sd3#
      • 1...Kc6+
        • 2.Sd7#
      • 1...Kd6
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sb7#
        • 2.Sd7#
      • 1...Rxa6
        • 2.Sxa6#
      • 1...Rab8
        • 2.Sb7#
      • 1...Rd7
        • 2.Sb3#
        • 2.Sd3#
        • 2.Sa4#
        • 2.Se4#
        • 2.Sb7#
        • 2.Sxd7#
      • 1...Rdb8
        • 2.Sb7#
      • 1...Sb3
        • 2.Sxb3#
      • 1...Sd3
        • 2.Sxd3#
      • 1...Se4
        • 2.Sxe4#
      • 1...Sd7
        • 2.Sxd7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 8
    • REMOVED MATES = 0
  • Sets
    • K(b);CHECK,S_FLIGHT::R(C)+S(H)
  • Tries
    • Try
      • P(K);CHECK,XR(e)
      • Vars
        • S(c);N_GUARD,P_SPINS(c)::QAR2(K),XS(c)
      • Refutation
        • R(d);XQ(K)
  • Actual
    • P(F);
    • Threat
      • DUALS(6)
    • Vars
      • K(b);CHECK,P-FLIGHT::R(G)+S(H),DCHECK
      • K(b);CHECK,S_FLIGHT::R(C)+S(H)
      • R(d);XP(I)::R(G)+S(H),XR(d)
      • R(d);::R(G)+S(H)
      • R(e);::R(G)+S(H)
      • S(a);::R(G)+S(H),XS(a)
      • S(c);::R(G)+S(H),XS(c)
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).