MESON Chess Problem Database

Problem Display
PID: 43624 (3Q4/1p3Ppb/1P2B1q1/1K1P3r/1N1k1p2/2p2P2/2rnR2B/3Rn3 w - - 0 1)

Jordan, Gijsbertus

De Problemist, 1930

3Q4/1p3Ppb/1P2B1q1/1K1P3r/1N1k1p2/2p2P2/2rnR2B/3Rn3

#2

11 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Bg1#
    • 1...Qxf7
      • 2.Bg1#
    • 1...Qg1
      • 2.Bxg1#
    • 1...Qf6
      • 2.Bg1#
    • 1...Qh6
      • 2.Bg1#
    • 1...Rxd5+
      • 2.Qxd5#
    • 1...Rf5
      • 2.Re4#
    • 1...Sd3
      • 2.Sxc2#
  • Tries
    • 1.Qf6+?
      • 1...Qxf6
        • 2.Bg1#
      • 1...Re5
        • 2.Qxe5#
      • 1...gxf6!
  • Keys
    • 1.Bf5!
      • threat
        • 2.Re4#
      • 1...Qxb6+
        • 2.Qxb6#
      • 1...Qc6+
        • 2.dxc6#
      • 1...Qxf5
        • 2.Bg1#
      • 1...Qe6
        • 2.dxe6#
      • 1...Sd3
        • 2.Sxc2#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 6
  • Sets
    • Q(h);N_GUARD::B(C)
    • Q(h);N_GUARD,XP(J)::B(C)
    • Q(h);N_GUARD::B(C),XQ(h)
    • R(g);CHECK,OGATE,P_SPINR(g),XP(G)::QAR1(K),XR(g)
    • R(g);S_CUTQ(h)::R1(B)
    • S(a);N_GUARD,N_SPINS(c),SBLOCK,S_CUTQ(h)::S(E),XR(b)
  • Tries
    • Try
      • Q(K);CHECK
      • Vars
        • Q(h);XQ(K)::B(C)
        • R(g);N_GUARD,P_SPINR(g)::QAB1(K),XR(g)
      • Refutation
        • P(j);XQ(K)
  • Actual
    • B(I);N_SPINP(G)
    • Threat
      • R1(B)
    • Vars
      • Q(h);CHECK,OGATE,XP(H)::QAB(K),XQ(h)
      • Q(h);CHECK,OGATE::QAR(K)+P(G),XQ(h)
      • Q(h);N_GUARD,P_PINP(G),XB(I)::B(C)
      • Q(h);OGATE::QAR(K)+P(G),XQ(h)
      • S(a);N_GUARD,N_SPINS(c)::S(E),XR(b)
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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).