MESON Chess Problem Database

Problem Display
PID: 135789 (3Rn3/8/3q4/B3N3/4Q1p1/2r1N1K1/3kpP2/bR2n3 w - - 0 1)

Erenburg, Mark

3rd Place, AGM, 2009

3Rn3/8/3q4/B3N3/4Q1p1/2r1N1K1/3kpP2/bR2n3

#2

8 + 8

721 Variantim 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Qd3
      • 2.Sc4#
    • 1...Qd4
      • 2.Sc4#
    • 1...Qd5
      • 2.Sc4#
    • 1...Qd7
      • 2.Sc4#
    • 1...Qxd8
      • 2.Sc4#
    • 1...Sc2
      • 2.Qxc2#
    • 1...Sg2
      • 2.Qc2#
    • 1...Sf3
      • 2.Sc4#
      • 2.Qc2#
  • Tries
    • 1.Bxc3+?
      • 1...Bxc3
        • 2.Sc4#
      • 1...Kxc3!
    • 1.Rxd6+?
      • 1...Sd3
        • 2.S5c4#
        • 2.Rxd3#
        • 2.Qxd3#
      • 1...Sxd6!
    • 1.Qh1?
      • threat
        • 2.Qxe1#
      • 1...Sc2
        • 2.Qc1#
      • 1...Sg2
        • 2.Qc1#
      • 1...Sf3
        • 2.Qc1#
      • 1...Sd3!
    • 1.Qd3+?
      • 1...Qxd3
        • 2.Sc4#
      • 1...Sxd3!
    • 1.f3?
      • threat
        • 2.Sc4#
      • 1...Qd3
        • 2.S5c4#
      • 1...Sd3!
  • Keys
    • 1.f4!
      • threat
        • 2.Sc4#
      • 1...gxf4 ep
        • 2.Sc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 7
  • Sets
    • Q(g);::S(G)
    • Q(g);N_SPINQ(g),XR(H)::S(G)
    • S(b);N_GUARD::QAR1(E),XS(b)
    • S(b);N_GUARD::QAR1(E)
  • Tries
    • Try
      • B(F);CHECK,N_SPINS(C),P_SPINS(G),XR(e)
      • Vars
        • B(a);SBLOCK,XB(F)::S(C)
      • Refutation
        • K(c);N_SPINQ(g),S_FLIGHT,XB(F)
    • Try
      • R(H);CHECK,XQ(g)
      • Refutation
        • S(h);XR(H)
    • Try
      • Q(E);
      • Threat
        • QAB1(E),XS(b)
      • Vars
        • S(b);OGATE::QAB1(E)
        • S(b);N_PINS(C),OGATE,P_PINS(G)::QAB1(E)
      • Refutation
        • S(b);N_PINS(C),N_SPINQ(g),P_PINS(G)
    • Try
      • Q(E);CHECK,N_PINQ(g),N_SPINS(C),P_SPINS(G)
      • Vars
        • Q(g);N_PINS(G),P_PINS(C),P_SPINQ(g),XQ(E)::S(G)
      • Refutation
        • S(b);XQ(E)
    • Try
      • P(B);N_SPINS(C),P_SPINS(G)
      • Threat
        • S(C)
      • Vars
        • Q(g);N_PINS(G)::S(G)
      • Refutation
        • S(b);N_SPINQ(g)
  • Actual
    • P(B);
    • Threat
      • S(G)
    • Vars
      • P(f);EP,N_PINS(C),P_PINS(G),XP(B)::S(C)
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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).