MESON Chess Problem Database

Problem Display
PID: 181153 (K2N4/1R6/2P1p2r/B2P2Qp/b2k4/1p1P4/2r1P3/1n6 w - - 0 1)

Larsen, Arne Absolon Koefoed

San Francisco Chronicle, 1904

K2N4/1R6/2P1p2r/B2P2Qp/b2k4/1p1P4/2r1P3/1n6

#2

9 + 8

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Rh7
      • 2.Sxe6#
    • 1...Sc3
      • 2.Bb6#
  • Tries
    • 1.Rb4+?
      • 1...Kc5
        • 2.Sb7#
      • 1...Rc4
        • 2.Rxc4#
      • 1...Kc3!
    • 1.Qe3+?
      • 1...Kxd5
        • 2.Rd7#
      • 1...Kxe3!
    • 1.Qe5+?
      • 1...Kc5
        • 2.Bb4#
        • 2.dxe6#
        • 2.d6#
      • 1...Kxe5!
    • 1.e3+?
      • 1...Kc5
        • 2.Bb4#
      • 1...Kxd3!
  • Keys
    • 1.Rd7!
      • threat
        • 2.dxe6#
      • 1...Bxc6+
        • 2.dxc6#
      • 1...Kc5
        • 2.dxe6#
      • 1...Rxc6
        • 2.dxc6#
      • 1...exd5
        • 2.Rxd5#
      • 1...Rc5
        • 2.Qf4#
      • 1...Rh7
        • 2.Sxe6#
      • 1...Sc3
        • 2.Bb6#
      • 1...e5
        • 2.Qg1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 6
    • REMOVED MATES = 0
  • Sets
    • R(h);N_GUARD::S(I),XP(g)
    • S(a);SBLOCK,S_CUTR(b)::B(C)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • K(e);S_FLIGHT::S(I)
        • R(b);N_GUARD,P_SPINR(b)::R1(G),XR(b)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(E);CHECK
      • Vars
        • K(e);P-FLIGHT,XP(D)::R(G)
      • Refutation
        • K(e);S_FLIGHT,XQ(E)
    • Try
      • Q(E);CHECK
      • Refutation
        • K(e);S_FLIGHT,XQ(E)
    • Try
      • P(A);CHECK
      • Vars
        • K(e);S_FLIGHT::B(C)
      • Refutation
        • K(e);P-FLIGHT,XP(B)
  • Actual
    • R(G);
    • Threat
      • R(G)+P(D),XP(g)
    • Vars
      • B(d);CHECK,OGATE,XP(F)::R(G)+P(D),XB(d)
      • K(e);S_FLIGHT::QAR(E)+P(D),XP(g)
      • R(b);OGATE,XP(F)::R(G)+P(D),XR(b)
      • P(g);OGATE,P_SPINP(g),XP(D)::R1(G),XP(g)
      • R(b);SBLOCK::QAR2(E)
      • R(h);N_GUARD::S(I),XP(g)
      • S(a);SBLOCK,S_CUTR(b)::B(C)
      • P(g);SBLOCK::QAB(E)
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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).