MESON Chess Problem Database

Problem Display
PID: 74398 (3RB3/bPn5/1p1N1N2/p1kP3R/1r3p1K/B1P5/q3P3/2Qr3b w - - 0 1)

Krelenbaum, Szaja

Tijdschrift vd KNSB, 1938

3RB3/bPn5/1p1N1N2/p1kP3R/1r3p1K/B1P5/q3P3/2Qr3b

#2

12 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Rg1
      • 2.Qxg1#
    • 1...Rd4
      • 2.cxb4#
    • 1...Rxd5
      • 2.Qg1#
    • 1...Be4
      • 2.Sfxe4#
    • 1...Bxd5
      • 2.Sfe4#
    • 1...f3+
      • 2.Sfe4#
    • 1...a4
      • 2.Bxb4#
  • Tries
    • 1.Qe3+?
      • 1...Rd4
        • 2.Qxd4#
        • 2.cxd4#
      • 1...fxe3+!
    • 1.b8Q?
      • threat
        • 2.Qxc7#
      • 1...f3+
        • 2.Sfe4#
      • 1...Sxd5
        • 2.Rc8#
        • 2.Qc7#
        • 2.Qc8#
      • 1...Sxe8
        • 2.Sd7#
      • 1...Sb5
        • 2.Sd7#
      • 1...Sa6
        • 2.Sd7#
      • 1...Se6
        • 2.Sd7#
      • 1...Sa8
        • 2.Sd7#
      • 1...Bxb8!
  • Keys
    • 1.Qxf4!
      • threat
        • 2.Sd7#
      • 1...Qxd5
        • 2.Qc4#
      • 1...Rxd5
        • 2.Qd4#
      • 1...Bxd5
        • 2.Sfe4#
      • 1...Sxd5
        • 2.Rc8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 5
  • Sets
    • R(a);OGATE::QAB(A),XR(a)
    • R(a);SBLOCK::QAR(A)+P(D)DCHECK,XR(d)
    • R(a);OGATE,XP(F)::QAB(A)
    • B(b);N_GUARD::S(I),XB(b)
    • B(b);N_GUARD,P_SPINB(b),XP(F)::S(I)
    • P(e);CHECK,S_CUTB(b)::S(I)
    • P(f);N_GUARD::B(C),XR(d)
  • Tries
    • Try
      • Q(A);CHECK
      • Refutation
        • P(e);CHECK,XQ(A)
    • Try
      • P(J);
      • Threat
        • QAR2(J),XS(j)
      • Vars
        • P(e);CHECK,S_CUTB(b)::S(I)
        • S(j);XB(L)::S(I)
        • S(j);::S(I)
      • Refutation
        • B(i);XQ(J)
  • Actual
    • Q(A);P_SPINQ(A),XP(e)
    • Threat
      • S(I)
    • Vars
      • Q(c);N_GUARD,P_SPINQ(c),XP(F)::QAR1(A)
      • R(a);N_GUARD,XP(F)::QAB1(A)
      • B(b);N_GUARD,P_SPINB(b),XP(F)::S(I)
      • S(j);OGATEB,P_SPINS(j),XP(F)::R(K)
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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).