MESON Chess Problem Database

Problem Display
PID: 239943 (8/2Q4K/b3r2p/p2p4/Rq2kpP1/8/2P1P3/BBn2N2 w - - 0 1)

Haring, Jacobus

Parallele 50, 1948

8/2Q4K/b3r2p/p2p4/Rq2kpP1/8/2P1P3/BBn2N2

#2

9 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qd4
      • 2.Rxd4#
    • 1...Re5
      • 2.Qxe5#
    • 1...Rb6
      • 2.Qe5#
    • 1...Rc6
      • 2.Qe5#
    • 1...Rf6
      • 2.Qe5#
    • 1...Rg6
      • 2.Qe5#
    • 1...Re7+
      • 2.Qxe7#
    • 1...Sb3
      • 2.c4#
  • Tries
    • 1.c4+?
      • 1...Sd3
        • 2.Bxd3#
      • 1...Qxb1!
  • Keys
    • 1.Qc5!
      • threat
        • 2.Sd2#
      • 1...Re7+
        • 2.Qxe7#
      • 1...Qd4
        • 2.Qxd4#
      • 1...f3
        • 2.Qe3#
      • 1...Bc4
        • 2.Qd4#
      • 1...Sb3
        • 2.c4#
      • 1...d4
        • 2.Qf5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 3
    • REMOVED MATES = 5
  • Sets
    • Q(b);OGATE::R1(F),XQ(b)
    • R(h);N_GUARD::QAR1(H),XR(h)
    • R(h);N_GUARD::QAR1(H)
    • R(h);CHECK,OGATEB::QAR(H),XR(h)
    • S(a);N_GUARD::B(B)+P(D)
  • Tries
    • Try
      • P(D);CHECK,N_PINQ(b)
      • Vars
        • S(a);N_GUARD,P_SPINS(a)::B(B),XS(a)
      • Refutation
        • Q(b);XB(B)
  • Actual
    • Q(H);
    • Threat
      • S(C)
    • Vars
      • R(h);CHECK,OGATEB::QAR(H),XR(h)
      • Q(b);N_GUARD::QAR1(H),XQ(b)
      • P(d);N_GUARD::QAR1(H)
      • B(g);N_SPINQ(b),S_CUTQ(b)::QAR1(H)
      • S(a);N_GUARD::B(B)+P(D)
      • P(f);N_SPINQ(b),OGATE::QAB1(H)
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).