MESON Chess Problem Database

Problem Display
PID: 262530 (6q1/3Q4/r1r3Pn/4PpR1/1R1NkP2/1Bppp2P/b6B/3N2K1 w - - 0 1)

Hjelle, David

Europe Echecs, 1969

6q1/3Q4/r1r3Pn/4PpR1/1R1NkP2/1Bppp2P/b6B/3N2K1

#2

12 + 10

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Qxd5#
    • 1...Qh7
      • 2.Qd5#
    • 1...Qxg6
      • 2.Qd5#
    • 1...Qg7
      • 2.Qd5#
    • 1...Qa8
      • 2.Qd5#
    • 1...Qb8
      • 2.Qd5#
    • 1...Qc8
      • 2.Qd5#
    • 1...Qe8
      • 2.Qd5#
    • 1...Qf8
      • 2.Qd5#
    • 1...Qh8
      • 2.Qd5#
    • 1...Rb6
      • 2.Sxc3#
    • 1...Rd6
      • 2.Sxc3#
    • 1...Re6
      • 2.Sxc3#
      • 2.Qd5#
    • 1...Rf6
      • 2.Sxc3#
    • 1...Rxg6
      • 2.Sxc3#
    • 1...Sg4
      • 2.Qxf5#
    • 1...Sf7
      • 2.Qxf5#
      • 2.Qd5#
    • 1...d2
      • 2.Bc2#
  • Tries
    • 1.Qxc6+?
      • 1...Qd5
        • 2.Sxc3#
        • 2.Qxd5#
      • 1...Rxc6!
  • Keys
    • 1.Rg3!
      • threat
        • 2.Rxe3#
      • 1...Kxf4
        • 2.Rg4#
      • 1...Qxg6
        • 2.Sxc6#
      • 1...Rxg6
        • 2.Se6#
      • 1...Sg4
        • 2.Qxf5#
      • 1...e2
        • 2.Re3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 2
    • ADDED MATES = 2
    • REMOVED MATES = 13
  • Sets
    • Q(j);N_GUARD::QAB1(L),XQ(j)
    • Q(j);N_GUARD::QAB1(L)
    • Q(j);N_GUARD,P_PINR(J),XP(K)::QAB1(L)
    • R(h);N_GUARD::S(A),XP(b)
    • R(h);N_GUARD,P_PINR(J),XP(K)::S(A),XP(b)
    • S(i);N_GUARD::QAB1(L),XP(f)
    • P(c);OGATEB::B(D)
  • Tries
    • Try
      • Q(L);CHECK,XR(h)
      • Refutation
        • R(g);XQ(L)
  • Actual
    • R(J);
    • Threat
      • R1(J),XP(d)
    • Vars
      • K(e);OGATEB,P-FLIGHT,XP(H)::B(C)+R(J),DCHECK
      • Q(j);N_GUARD,P_PINR(J),XP(K)::R(F)+S(G),XR(h)
      • R(h);N_GUARD,P_PINR(J),XP(K)::R(F)+S(G)
      • S(i);N_GUARD::QAB1(L),XP(f)
      • P(d);::R1(J)
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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).