MESON Chess Problem Database

Problem Display
PID: 199324 (8/2n4K/r4p2/1pR2p2/3pkP2/1Q2N1RN/r4n2/8 w - - 0 1)

Froberg, Johan Hilding Laurentius

Suomen Shakki, 1988

8/2n4K/r4p2/1pR2p2/3pkP2/1Q2N1RN/r4n2/8

#2

7 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...dxe3
      • 2.Qxe3#
    • 1...d3
      • 2.Qb4#
  • Tries
    • 1.Sd1?
      • threat
        • 2.Qf3#
      • 1...d3
        • 2.Qb4#
      • 1...R2a3
        • 2.Sdxf2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...R6a3!
    • 1.Sf1?
      • threat
        • 2.Qf3#
      • 1...d3
        • 2.Qb4#
      • 1...R2a3
        • 2.Sd2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...R6a3!
    • 1.Sg2?
      • threat
        • 2.Qf3#
      • 1...d3
        • 2.Qb4#
      • 1...R2a3
        • 2.Sxf2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...R6a3!
    • 1.Sc4?
      • threat
        • 2.Qf3#
      • 1...R6a3
        • 2.Sd6#
      • 1...R2a3
        • 2.Sd2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...d3!
    • 1.Sg4?
      • threat
        • 2.Qf3#
      • 1...d3
        • 2.Qb4#
      • 1...R6a3
        • 2.Sxf6#
      • 1...R2a3
        • 2.Sgxf2#
      • 1...Sd3
        • 2.Qxd3#
      • 1...fxg4!
    • 1.Sxf5?
      • threat
        • 2.Qf3#
      • 1...Sd5
        • 2.Qxd5#
      • 1...R6a3
        • 2.Sd6#
      • 1...Sd3
        • 2.Qxd3#
      • 1...d3
        • 2.Re3#
        • 2.Qb4#
      • 1...R2a3!
    • 1.Sxf2+?
      • 1...Kxf4
        • 2.Sg2#
      • 1...Rxf2!
    • 1.Sg5+?
      • 1...Kxf4
        • 2.Sg2#
      • 1...fxg5!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Qf3#
      • 1...d3
        • 2.Qb4#
      • 1...R6a3
        • 2.Sxf6#
      • 1...R2a3
        • 2.Sxf2#
      • 1...Sd3
        • 2.Qxd3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • P(c);OGATE,XS(B)::QAR1(A),XP(c)
    • P(c);OGATEB,SBLOCK::QAR(A)
  • Tries
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR(A)
        • R(a);N_GUARD::S(B),XS(b)
        • S(b);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • R(g);
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR(A)
        • R(a);N_GUARD::S(B)
        • S(b);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • R(g);
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR(A)
        • R(a);N_GUARD::S(D),XS(b)
        • S(b);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • R(g);
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • R(g);N_GUARD::S(B)
        • R(a);N_GUARD::S(B)
        • S(b);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • P(c);
    • Try
      • S(B);
      • Threat
        • QAB1(A)
      • Vars
        • P(c);OGATEB::QAR(A)
        • R(g);N_GUARD::S(B),XP(h)
        • R(a);N_GUARD::S(B),XS(b)
        • S(b);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • P(f);XS(B)
    • Try
      • S(B);XP(f)
      • Threat
        • QAB1(A)
      • Vars
        • S(i);N_GUARD::QAB1(A),XS(i)
        • R(g);N_GUARD::S(B)
        • S(b);N_GUARD::QAB1(A),XS(b)
      • Refutation
        • R(a);
    • Try
      • S(D);CHECK,XS(b)
      • Vars
        • K(d);P-FLIGHT,XP(E)::S(B)
      • Refutation
        • R(a);XS(D)
    • Try
      • S(D);CHECK
      • Vars
        • K(d);P-FLIGHT,XP(E)::S(B)
      • Refutation
        • P(h);XS(D)
  • Actual
    • S(B);
    • Threat
      • QAB1(A)
    • Vars
      • P(c);OGATEB::QAR(A)
      • R(g);N_GUARD::S(B),XP(h)
      • R(a);N_GUARD::S(D),XS(b)
      • S(b);N_GUARD::QAB1(A),XS(b)
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).