MESON Chess Problem Database

Problem Display
PID: 262526 (3r3b/1b6/8/N5NK/1B1k1P2/4npp1/Q1P2P2/4r2n w - - 0 1)

Hjelle, David

Europe Echecs, 1971

3r3b/1b6/8/N5NK/1B1k1P2/4npp1/Q1P2P2/4r2n

#2

8 + 9

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Qb2#
    • 1...Be4
      • 2.Se6#
    • 1...Bd5
      • 2.Qb2#
    • 1...Ba6
      • 2.Sc6#
    • 1...Bc6
      • 2.Sxc6#
    • 1...Bc8
      • 2.Sc6#
    • 1...Sd1
      • 2.Qc4#
    • 1...Sf1
      • 2.Qc4#
    • 1...Sxc2
      • 2.Qc4#
    • 1...Sg2
      • 2.Qc4#
    • 1...Sc4
      • 2.Qxc4#
    • 1...Sg4
      • 2.Qc4#
    • 1...Sd5
      • 2.Qc4#
    • 1...Sf5
      • 2.Qc4#
  • Tries
    • 1.Qb3?
      • threat
        • 2.Qd3#
      • 1...Sxc2
        • 2.Qc4#
      • 1...Rd1
        • 2.fxe3#
      • 1...Be4
        • 2.Se6#
      • 1...Ba6
        • 2.Sc6#
      • 1...Sxf2!
    • 1.fxe3+?
      • 1...Rxe3
        • 2.Qc4#
      • 1...Kxe3!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Sb3#
      • 1...Sxc2
        • 2.Qc4#
      • 1...Rb1
        • 2.fxe3#
      • 1...Rd5
        • 2.Qe4#
      • 1...Bd5
        • 2.Qb6#
      • 1...Sd5
        • 2.Sxf3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 10
  • Sets
    • R(h);P_PINS(G),SBLOCK::QAB(A)
    • B(g);SBLOCK::S(G)
    • B(g);SBLOCK::QAB(A)
    • B(g);N_GUARD::S(F)
    • B(g);N_GUARD::S(F),XB(g)
    • S(c);N_GUARD::QAR1(A)
    • S(c);N_GUARD,XP(B)::QAR1(A)
    • S(c);N_GUARD::QAR1(A),XS(c)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAR1(A)
      • Vars
        • S(c);N_GUARD,XP(B)::QAR1(A)
        • R(a);N_GUARD::P(C),XS(c)
        • B(g);SBLOCK::S(G)
        • B(g);N_GUARD::S(F)
      • Refutation
        • S(b);XP(C)
    • Try
      • P(C);CHECK,XS(c)
      • Vars
        • R(a);SBLOCK,XP(C)::QAR1(A)
      • Refutation
        • K(f);S_FLIGHT,XP(C)
  • Actual
    • Q(A);
    • Threat
      • S(F)
    • Vars
      • S(c);N_GUARD,XP(B)::QAR1(A)
      • R(a);N_GUARD::P(C),XS(c)
      • R(h);P_PINS(G),S_CUTB(g)::QAR1(A)
      • B(g);SBLOCK::QAB(A)
      • S(c);S_CUTB(g)::S(G),XP(d)
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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).