MESON Chess Problem Database

Problem Display
PID: 108363 (2Nb4/5Q2/p5p1/Rb2k3/1pP3Pp/3nnK2/2NP1B2/4r3 w - - 0 1)

de Haas, Bastian Evert

Match: Netherlands - Poland, 1990

2Nb4/5Q2/p5p1/Rb2k3/1pP3Pp/3nnK2/2NP1B2/4r3

#2

9 + 10

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bxa5
      • 2.Qe7#
    • 1...Bb6
      • 2.Qe7#
    • 1...Bc7
      • 2.Qe7#
    • 1...Be7
      • 2.Qxe7#
    • 1...Sc1
      • 2.d4#
    • 1...Sb2
      • 2.d4#
    • 1...Sxf2
      • 2.d4#
    • 1...Sf4
      • 2.d4#
    • 1...Sc5
      • 2.d4#
    • 1...Sd1
      • 2.Bd4#
    • 1...Sf1
      • 2.Bd4#
    • 1...Sg2
      • 2.Bd4#
    • 1...Sxc4
      • 2.Bd4#
    • 1...Sxg4
      • 2.Bd4#
    • 1...Sd5
      • 2.Bd4#
  • Tries
    • 1.Bg3+?
      • 1...Sf4
        • 2.Bxf4#
        • 2.d4#
      • 1...hxg3!
    • 1.Rxb5+?
      • 1...Sc5
        • 2.d4#
      • 1...Sd5
        • 2.Bd4#
        • 2.Rxd5#
      • 1...axb5!
    • 1.Qe8+?
      • 1...Be7
        • 2.Qxe7#
      • 1...Kf6!
    • 1.Qg7+?
      • 1...Ke6
        • 2.Sd4#
      • 1...Bf6!
  • Keys
    • 1.Sd4!
      • threat
        • 2.Sc6#
      • 1...Kxd4
        • 2.Qd5#
      • 1...Bxa5
        • 2.Qg7#
      • 1...Sc5
        • 2.Qf4#
      • 1...Sd5
        • 2.Qe6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 1
    • REMOVED MATES = 12
  • Sets
    • B(j);N_GUARD,N_SPINB(f),XR(G)::QAR2(H)
    • B(j);N_GUARD::QAR2(H)
    • B(j);N_GUARD::QAR2(H),XB(j)
    • S(b);OGATE::P(B)
    • S(b);OGATE,XB(C)::P(B)
    • S(b);N_SPINB(f),OGATE::P(B)
    • S(c);OGATE::B(C)
    • S(c);OGATE,XP(E)::B(C)
    • S(c);OGATE,XP(F)::B(C)
    • S(c);N_SPINB(f),OGATE::B(C)
  • Tries
    • Try
      • B(C);CHECK
      • Refutation
        • P(e);XB(C)
    • Try
      • R(G);CHECK,XB(f)
      • Vars
        • S(b);OGATE,P_SPINS(b)::P(B)
      • Refutation
        • P(h);XR(G)
    • Try
      • Q(H);CHECK
      • Vars
        • B(j);N_GUARD::QAR2(H),XB(j)
      • Refutation
        • K(g);N_SPINB(f),S_FLIGHT
    • Try
      • Q(H);CHECK
      • Vars
        • K(g);N_SPINB(f),P-FLIGHT::S(A)
      • Refutation
        • B(j);
  • Actual
    • S(A);
    • Threat
      • S(A)
    • Vars
      • K(g);N_SPINB(f),P_SPINS(c),S_FLIGHT,XS(A)::QAR1(H)
      • B(j);N_GUARD,N_SPINB(f),XR(G)::QAB(H)
      • S(b);N_GUARD,N_SPINB(f)::QAB1(H)
      • S(c);N_SPINB(f)::QAR1(H)
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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).