MESON Chess Problem Database

Problem Display
PID: 120619 (K7/p7/R1p2P2/rPB5/3PknQ1/1P2Npn1/b1PPp3/1B6 w - - 0 1)

Jonsson, Gustav

Shakhmaty, 1955

K7/p7/R1p2P2/rPB5/3PknQ1/1P2Npn1/b1PPp3/1B6

#2

12 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxb3
      • 2.cxb3#
    • 1...Sf1
      • 2.Qf5#
    • 1...Sh1
      • 2.Qf5#
    • 1...Sf5
      • 2.Qxf5#
    • 1...Sh5
      • 2.Qf5#
    • 1...cxb5
      • 2.Re6#
  • Tries
    • 1.Bd6?
      • threat
        • 2.Qxf4#
      • 1...Kxd4
        • 2.c3#
      • 1...Sh5!
    • 1.Rxc6?
      • threat
        • 2.Re6#
      • 1...Bxb3
        • 2.cxb3#
      • 1...Ra6!
    • 1.Qg5?
      • threat
        • 2.Qe5#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sd3
        • 2.cxd3#
      • 1...Sg6
        • 2.d3#
      • 1...f2!
    • 1.Qg6+?
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sxg6!
  • Keys
    • 1.Sd5!
      • threat
        • 2.Sc3#
      • 1...Kxd5
        • 2.c4#
      • 1...cxd5
        • 2.Re6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 6
  • Sets
    • B(a);OGATE,XP(D)::B(A)+P(B),XB(a)
    • S(d);N_GUARD::QAB1(G)
    • S(d);N_GUARD::QAB1(G),XS(d)
    • P(h);OGATE,XP(H)::R(J)
  • Tries
    • Try
      • B(I);
      • Threat
        • QAR1(G),XS(f)
      • Vars
        • K(e);P-FLIGHT,XP(F)::P(B)
      • Refutation
        • S(d);
    • Try
      • R(J);XP(h)
      • Threat
        • R(J)
      • Vars
        • B(a);OGATE,XP(D)::B(A)+P(B),XB(a)
      • Refutation
        • R(g);
    • Try
      • Q(G);N_PINS(f)
      • Threat
        • QAR1(G)
      • Vars
        • S(d);N_GUARD::QAB1(G),XS(d)
        • S(f);OGATE::P(B),XS(f)
        • S(f);N_GUARD::P(C)
      • Refutation
        • P(c);
    • Try
      • Q(G);CHECK,N_PINS(f)
      • Vars
        • S(d);N_GUARD,P_SPINS(d)::QAB1(G),XS(d)
      • Refutation
        • S(f);XQ(G)
  • Actual
    • S(E);
    • Threat
      • S(E)
    • Vars
      • K(e);N_SPINS(f),S_FLIGHT,XS(E)::P(B)
      • P(h);OGATE,SBLOCK,XS(E)::R(J)
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).