MESON Chess Problem Database

Problem Display
PID: 90845 (8/2NBb3/N3rpp1/4kP2/1pR1pqr1/1P1pR1B1/3K4/5Q2 w - - 0 1)

Jonsson, Gustav

Die Schwalbe, 1960

8/2NBb3/N3rpp1/4kP2/1pR1pqr1/1P1pR1B1/3K4/5Q2

#2

10 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rg5
      • 2.Qxf4#
    • 1...Rd6
      • 2.Rxe4#
  • Tries
    • 1.Bxf4+?
      • 1...Kxf5
        • 2.Bxe6#
      • 1...Rxf4!
    • 1.Rxe4+?
      • 1...Kd6
        • 2.Rd4#
        • 2.Qxd3#
      • 1...Kxf5!
    • 1.Rc5+?
      • 1...Kd4
        • 2.Sb5#
        • 2.Sxe6#
        • 2.Rd5#
        • 2.Qa1#
      • 1...Kd6
        • 2.Rd5#
      • 1...Bxc5!
    • 1.Qa1+?
      • 1...Kd6
        • 2.Qd4#
      • 1...Kxf5!
  • Keys
    • 1.Rd4!
      • threat
        • 2.Rd5#
      • 1...Kxd4
        • 2.Qa1#
      • 1...Kxf5
        • 2.Rd5#
      • 1...Rd6
        • 2.Rxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(e);N_GUARD::QAB1(A),XQ(d)
    • R(g);SBLOCK::R1(F),XP(c)
  • Tries
    • Try
      • B(E);CHECK,N_SPINR(D),XQ(d)
      • Vars
        • K(f);N_SPINP(c),P-FLIGHT,P_SPINR(g),XP(G)::B(J),XR(g)
      • Refutation
        • R(e);XB(E)
    • Try
      • R(F);CHECK,XP(c)
      • Refutation
        • K(f);P-FLIGHT,P_SPINR(g),XP(G)
    • Try
      • R(F);CHECK
      • Vars
        • K(f);N_SPINP(c),S_FLIGHT::R1(F)
      • Refutation
        • B(j);XR(F)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);N_SPINP(c),S_FLIGHT::QAR2(A)
      • Refutation
        • K(f);N_SPINP(c),N_SPINQ(d),P-FLIGHT,P_SPINR(g),XP(G)
  • Actual
    • R(F);
    • Threat
      • R1(F)
    • Vars
      • K(f);N_SPINP(c),N_SPINQ(d),OGATEB,S_FLIGHT,XR(F)::QAB(A)
      • K(f);N_SPINP(c),P-FLIGHT,P_SPINR(g),XP(G)::R(F)
      • R(g);SBLOCK::R1(F),XP(c)
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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).