MESON Chess Problem Database

Problem Display
PID: 173085 (4bB2/2p2n1K/Bpk1pN2/1p2PNp1/Pr3p2/5R2/r1q5/2RQ4 w - - 0 1)

Barulin, Mikhail Mikhailovich

Magyar Sakkvilag, 1929

4bB2/2p2n1K/Bpk1pN2/1p2PNp1/Pr3p2/5R2/r1q5/2RQ4

#2

10 + 12

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qc4
      • 2.Sd4#
    • 1...Qc5
      • 2.Se7#
    • 1...Rc4
      • 2.axb5#
    • 1...Rd4
      • 2.axb5#
    • 1...Re4
      • 2.axb5#
    • 1...Bd7
      • 2.Qxd7#
    • 1...exf5
      • 2.Qd5#
  • Tries
    • 1.Rxc2+?
      • 1...Rc4
        • 2.Sd4#
        • 2.axb5#
      • 1...Rxc2!
    • 1.Rc3+?
      • 1...Rc4
        • 2.axb5#
      • 1...Qxc3!
    • 1.Qxc2+?
      • 1...Rc4
        • 2.Sd4#
        • 2.Qe4#
        • 2.axb5#
      • 1...Rxc2!
  • Keys
    • 1.Qh1!
      • threat
        • 2.Rc3#
      • 1...Qc3
        • 2.Rfxc3#
      • 1...Qc4
        • 2.Sd4#
      • 1...Qc5
        • 2.Se7#
      • 1...Rc4
        • 2.axb5#
      • 1...Re4
        • 2.axb5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • Q(b);N_PINS(F)::S(F)
    • R(c);N_GUARD,N_SPINQ(b)::P(D),XP(e)
    • R(c);N_GUARD::P(D),XP(e)
    • R(c);N_GUARD,N_PINS(F)::P(D),XP(e)
    • B(l);N_GUARD::QAB1(B),XB(l)
    • P(i);N_GUARD,XS(F)::QAB1(B)
  • Tries
    • Try
      • R(A);CHECK,N_SPINS(F),XQ(b)
      • Refutation
        • R(a);XR(A)
    • Try
      • R(C);CHECK,N_PINQ(b)
      • Vars
        • R(c);P_SPINR(c)::P(D),XP(e)
      • Refutation
        • Q(b);N_PINS(F),P_SPINQ(b),XR(C)
    • Try
      • Q(B);CHECK,N_SPINS(F),XQ(b)
      • Refutation
        • R(a);P_SPINR(a),XQ(B)
  • Actual
    • Q(B);
    • Threat
      • QAB(B)+R(C),DCHECK
    • Vars
      • Q(b);N_PINS(F)::QAB(B)+R(C),DCHECK,XQ(b)
      • Q(b);N_PINS(F)::S(F)
      • R(c);N_GUARD,N_SPINQ(b)::P(D),XP(e)
      • R(c);N_GUARD,N_PINS(F)::P(D),XP(e)
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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).