MESON Chess Problem Database

Problem Display
PID: 87741 (1QN3B1/4b3/n1bp3N/2P1k1P1/6Rn/Kp4rr/7B/8 w - - 0 1)

Racz, Erich

Buletin Problemistic, 1970

1QN3B1/4b3/n1bp3N/2P1k1P1/6Rn/Kp4rr/7B/8

#2

9 + 9

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxg5
      • 2.Qxd6#
    • 1...Bf6
      • 2.Qxd6#
    • 1...Bd8
      • 2.Qxd6#
  • Tries
    • 1.Qb4?
      • threat
        • 2.Qc3#
        • 2.Qd4#
        • 2.Qf4#
      • 1...b2+
        • 2.Qc3#
      • 1...Rxh2
        • 2.Qd4#
        • 2.Qf4#
      • 1...Bxg5
        • 2.Qc3#
        • 2.Qd4#
      • 1...dxc5
        • 2.Qc3#
        • 2.Qf4#
      • 1...Be4
        • 2.Rxe4#
        • 2.Qc3#
        • 2.Qxe4#
      • 1...Sg2
        • 2.Qc3#
        • 2.Qd4#
      • 1...Sf3
        • 2.Qf4#
      • 1...Sf5
        • 2.Qf4#
      • 1...Sg6
        • 2.Qc3#
        • 2.Qd4#
      • 1...d5
        • 2.Qe1#
        • 2.Qd4#
        • 2.Qf4#
      • 1...Sxb4!
  • Keys
    • 1.Qxb3!
      • threat
        • 2.Qc3#
      • 1...Rxh2
        • 2.Qxg3#
      • 1...Sf3
        • 2.Qe6#
      • 1...Sf5
        • 2.Sf7#
      • 1...d5
        • 2.Qe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 3
  • Sets
    • B(i);N_GUARD,XP(E)::QAB1(G),XP(h)
    • B(i);N_GUARD::QAB1(G),XP(h)
  • Tries
    • Try
      • Q(G);N_PINP(h)
      • Threat
        • DUALS(3)
      • Vars
        • P(a);CHECK::QAB(G)
        • S(d);::QAB1(G)
      • Refutation
        • S(f);XQ(G)
  • Actual
    • Q(G);N_PINP(h),P_SPINQ(G),XP(a)
    • Threat
      • QAB(G)
    • Vars
      • R(c);N_GUARD,N_SPINR(b),XB(A)::QAB(G),XR(b)
      • S(d);N_PINQ(G)::QAR1(G)
      • S(d);SBLOCK::S(F)
      • P(h);P_PINP(D),S_CUTB(g)::QAR2(G)
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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).