MESON Chess Problem Database

Problem Display
PID: 230821 (3R4/3q4/2pBp3/N1P3N1/n2kP1p1/3p4/1P1Qp3/4K3 w - - 0 1)

Haring, Jacobus

Stella Polaris, 1968

3R4/3q4/2pBp3/N1P3N1/n2kP1p1/3p4/1P1Qp3/4K3

#2

9 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sc3
      • 2.bxc3#
  • Tries
    • 1.Sxc6+?
      • 1...Kc4
        • 2.Qb4#
      • 1...Qxc6!
    • 1.Qc3+?
      • 1...Ke3
        • 2.Sc4#
      • 1...Sxc3!
    • 1.Qf4?
      • threat
        • 2.Qf2#
      • 1...d2+
        • 2.Qxd2#
      • 1...Qxd6
        • 2.Sxe6#
      • 1...Qf7
        • 2.Be7#
      • 1...g3
        • 2.Sf3#
      • 1...Sxb2!
  • Keys
    • 1.Qc1!
      • threat
        • 2.Sb3#
      • 1...d2+
        • 2.Qxd2#
      • 1...Qxd6
        • 2.Sxc6#
      • 1...Sxc5
        • 2.Qxc5#
      • 1...Qb7
        • 2.Bc7#
      • 1...Sc3
        • 2.bxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 0
  • Sets
    • S(c);OGATE::P(B),XS(c)
  • Tries
    • Try
      • S(E);CHECK,XP(f)
      • Vars
        • K(d);N_SPINP(b),P-FLIGHT::QAR1(C)
      • Refutation
        • Q(h);XS(E)
    • Try
      • Q(C);CHECK,N_PINP(b)
      • Vars
        • K(d);P_SPINP(b),S_FLIGHT::S(E)
      • Refutation
        • S(c);XQ(C)
    • Try
      • Q(C);N_PINP(b)
      • Threat
        • QAB(C)
      • Vars
        • P(b);CHECK,OGATEB::QAR2(C),XP(b)
        • Q(h);N_GUARD,P_SPINQ(h),XB(H)::S(G),XP(g)
        • Q(h);OGATEB::R(I)+B(H)
        • P(e);N_GUARD::S(G)
      • Refutation
        • S(c);XP(B)
  • Actual
    • Q(C);N_PINP(b)
    • Threat
      • S(E)
    • Vars
      • P(b);CHECK,OGATEB::QAR2(C),XP(b)
      • Q(h);N_GUARD,P_SPINQ(h),XB(H)::S(E),XP(f)
      • S(c);OGATE,XP(F)::QAB1(C),XS(c)
      • Q(h);OGATEB::R(I)+B(H)
      • S(c);OGATE::P(B),XS(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).