MESON Chess Problem Database

Problem Display
PID: 157328 (4r1BQ/rN4nK/3R4/bR5p/3nk2P/4P3/1BP2PPN/3q4 w - - 0 1)

Hjelle, David

Land og Folk, 1979

4r1BQ/rN4nK/3R4/bR5p/3nk2P/4P3/1BP2PPN/3q4

#2

13 + 8

15148 Sadier Collection 2016

SOLUTION

  • SOUND
  • Sets
    • 1...Qxc2
      • 2.Rxd4#
    • 1...Qe2
      • 2.Rxd4#
    • 1...Qf3
      • 2.Rxd4#
    • 1...Qg4
      • 2.Rxd4#
    • 1...Qa1
      • 2.Rxd4#
    • 1...Qb1
      • 2.Rxd4#
    • 1...Qc1
      • 2.Rxd4#
    • 1...Qe1
      • 2.Rxd4#
    • 1...Qf1
      • 2.Rxd4#
    • 1...Qg1
      • 2.Rxd4#
    • 1...Qh1
      • 2.Rxd4#
    • 1...Bd2
      • 2.Rxd4#
    • 1...Sdf5
      • 2.Sc5#
    • 1...Sde6
      • 2.Re5#
    • 1...Sgf5
      • 2.Bd5#
    • 1...Sge6
      • 2.Re5#
      • 2.Qe5#
  • Tries
    • 1.Bd5+?
      • 1...Ke5
        • 2.Bf3#
        • 2.Bc6#
      • 1...Kf5!
    • 1.Re6+?
      • 1...Sdxe6
        • 2.Re5#
      • 1...Sgxe6
        • 2.Re5#
        • 2.Qe5#
      • 1...Rxe6!
  • Keys
    • 1.Sf1!
      • threat
        • 2.Sg3#
      • 1...Qxc2
        • 2.Rxd4#
      • 1...Qxf1
        • 2.Rxd4#
      • 1...Qf3
        • 2.Rxd4#
      • 1...Qg4
        • 2.Rxd4#
      • 1...Se2
        • 2.f3#
      • 1...Sdf5
        • 2.Sc5#
      • 1...Sgf5
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 9
  • Sets
    • Q(a);N_GUARD,XP(B)::R1(I),XS(b)
    • Q(a);N_GUARD::R1(I),XS(b)
    • B(d);S_CUTQ(a)::R1(I),XS(b)
    • S(b);SBLOCK::S(J)
    • S(b);S_CUTR(h)::R1(H)
    • S(g);P_PINS(J),SBLOCK::B(L)
  • Tries
    • Try
      • B(L);CHECK
      • Refutation
        • K(c);S_FLIGHT
    • Try
      • R(I);CHECK
      • Vars
        • S(b);XR(I)::R1(H)
      • Refutation
        • R(h);XR(I)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • Q(a);N_GUARD,XP(B)::R1(I),XS(b)
      • Q(a);N_GUARD,XS(E)::R1(I),XS(b)
      • Q(a);N_GUARD::R1(I),XS(b)
      • S(b);N_GUARD,S_CUTQ(a)::P(C)
      • S(b);SBLOCK::S(J)
      • S(g);P_PINS(J),SBLOCK::B(L)
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).