MESON Chess Problem Database

Problem Display
PID: 16609 (1q6/2Q1b3/1n4rB/rR3b1N/2PNk3/2P4R/P3P1n1/5K2 w - - 0 1)

Froberg, Johan Hilding Laurentius

1st Prize, Abo Underrattelsers Schacktidning, 1942

1q6/2Q1b3/1n4rB/rR3b1N/2PNk3/2P4R/P3P1n1/5K2

#2

11 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Qa7
      • 2.Qe5#
    • 1...Qb7
      • 2.Qe5#
    • 1...Qa8
      • 2.Qe5#
    • 1...Qc8
      • 2.Qe5#
    • 1...Qd8
      • 2.Qe5#
    • 1...Qe8
      • 2.Qe5#
    • 1...Qf8
      • 2.Qe5#
    • 1...Qg8
      • 2.Qe5#
    • 1...Rxa2
      • 2.Re5#
    • 1...Ra3
      • 2.Re5#
    • 1...Ra4
      • 2.Re5#
    • 1...Ra6
      • 2.Re5#
    • 1...Ra7
      • 2.Re5#
    • 1...Ra8
      • 2.Re5#
    • 1...Rg3
      • 2.Sxg3#
    • 1...Rc6
      • 2.Sg3#
    • 1...Rd6
      • 2.Sg3#
    • 1...Re6
      • 2.Sg3#
    • 1...Rf6
      • 2.Sg3#
    • 1...Bg4
      • 2.Sg3#
    • 1...Se1
      • 2.Re3#
    • 1...Se3+
      • 2.Rxe3#
    • 1...Sh4
      • 2.Re3#
  • Tries
    • 1.Qc6+?
      • 1...Sd5
        • 2.Qxd5#
      • 1...Rxc6!
    • 1.Qxe7+?
      • 1...Qe5
        • 2.Qxe5#
      • 1...Re6
        • 2.Sf6#
      • 1...Be6!
  • Keys
    • 1.Sb3!
      • threat
        • 2.Sd2#
      • 1...Se3+
        • 2.Rxe3#
      • 1...Rxa2
        • 2.Re5#
      • 1...Sxc4
        • 2.Qxc4#
      • 1...Qd8
        • 2.Qe5#
      • 1...Rd6
        • 2.Sg3#
      • 1...Bg5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 19
  • Sets
    • Q(h);N_GUARD::QAR1(K)
    • R(c);N_GUARD,XP(B)::R1(H)
    • R(c);N_GUARD::R1(H)
    • R(f);N_GUARD::S(I),XR(f)
    • R(f);N_GUARD::S(I)
    • B(d);S_CUTR(f)::S(I)
    • S(a);N_GUARD::R1(E)
    • S(a);CHECK,N_GUARD::R1(E),XS(a)
  • Tries
    • Try
      • Q(K);CHECK
      • Vars
        • S(e);N_GUARD,P_SPINS(e)::QAB1(K),XS(e)
      • Refutation
        • R(f);XQ(K)
    • Try
      • Q(K);CHECK,XB(g)
      • Vars
        • Q(h);N_GUARD,P_SPINQ(h)::QAR1(K),XQ(h)
        • R(f);P_SPINR(f)::S(I)
      • Refutation
        • B(d);P_SPINB(d)
  • Actual
    • S(G);
    • Threat
      • S(G)
    • Vars
      • S(a);CHECK,N_GUARD::R1(E),XS(a)
      • R(c);N_GUARD,XP(B)::R1(H)
      • S(e);OGATE,XP(F)::QAR2(K),XS(e)
      • Q(h);N_GUARD::QAR1(K)
      • R(f);N_GUARD::S(I)
      • B(g);N_GUARD::S(G)
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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).