MESON Chess Problem Database

Problem Display
PID: 138977 (3R1rB1/6r1/n1pB4/4P3/Q1pkN1R1/5P2/1n2K3/8 w - - 0 1)

Boudantsev, Alex

4th Prize, BCF 122. Ty., 1969-1970

3R1rB1/6r1/n1pB4/4P3/Q1pkN1R1/5P2/1n2K3/8

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Sd1
      • 2.Qxd1#
      • 2.Qxc4#
    • 1...Sd3
      • 2.Qxc4#
  • Tries
    • 1.Ba3+?
      • 1...Rd7
        • 2.Bxb2#
      • 1...Rxd8
        • 2.Bxb2#
      • 1...Kxe5!
    • 1.Bb4+?
      • 1...Rd7
        • 2.Bc3#
      • 1...Rxd8
        • 2.Bc3#
      • 1...Kxe5!
    • 1.Bc7+?
      • 1...Rd7
        • 2.Rxd7#
      • 1...Rxd8!
    • 1.Bb8+?
      • 1...Rd7
        • 2.Rxd7#
      • 1...Rxd8!
  • Keys
    • 1.Qa5!
      • threat
        • 2.Qc3#
      • 1...Rgxg8
        • 2.Bxf8#
      • 1...Rxf3
        • 2.Be7#
      • 1...Rfxg8
        • 2.Sg5#
      • 1...Rgf7
        • 2.Sf6#
      • 1...Rff7
        • 2.Be7#
      • 1...Sd1
        • 2.Qd2#
      • 1...Sa4
        • 2.Qd2#
      • 1...Sb4
        • 2.Qc5#
      • 1...c3
        • 2.Qxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 9
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD::QAR1(C),XP(b)
  • Tries
    • Try
      • B(G);CHECK
      • Vars
        • R(f);P_SPINR(f)::B(G),XS(a)
        • R(g);XR(H)::B(G),XS(a)
      • Refutation
        • K(c);N_SPINP(b),S_FLIGHT,XP(F)
    • Try
      • B(G);CHECK,N_PINP(b)
      • Vars
        • R(f);P_SPINR(f)::B(G)
        • R(g);XR(H)::B(G)
      • Refutation
        • K(c);S_FLIGHT,XP(F)
    • Try
      • B(G);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(H),XR(f)
      • Refutation
        • R(g);XR(H)
    • Try
      • B(G);CHECK
      • Vars
        • R(f);N_GUARD,P_SPINR(f)::R(H),XR(f)
      • Refutation
        • R(g);XR(H)
  • Actual
    • Q(C);N_PINP(b)
    • Threat
      • QAB1(C)
    • Vars
      • R(f);N_GUARD,XB(I)::R(H)+B(G),XR(g)
      • R(g);N_GUARD,XP(B)::R(H)+B(G)
      • R(g);N_GUARD,XB(I)::R(E)+S(D)
      • R(f);N_GUARD::R(E)+S(D)
      • R(g);N_GUARD::R(H)+B(G)
      • S(a);N_GUARD::QAR2(C)
      • S(d);N_GUARD::QAB1(C)
      • P(b);::QAB1(C),XP(b)
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).