MESON Chess Problem Database

Problem Display
PID: 68377 (6R1/3n4/3B4/Kpp1qB2/8/4NPpp/1Q1P3k/4R3 w - - 0 1)

Chapman, CF

Chess, 1949

6R1/3n4/3B4/Kpp1qB2/8/4NPpp/1Q1P3k/4R3

#2

9 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Qxb2
      • 2.Bxg3#
    • 1...Qc3+
      • 2.dxc3#
    • 1...Qd4
      • 2.Bxg3#
    • 1...Qf6
      • 2.Bxg3#
      • 2.d4#
    • 1...Qg7
      • 2.d4#
    • 1...Qh8
      • 2.Bxg3#
      • 2.d4#
    • 1...Qxe3
      • 2.dxe3#
    • 1...Qe4
      • 2.Bxg3#
      • 2.d3#
    • 1...Qd5
      • 2.Bxg3#
      • 2.d3#
      • 2.d4#
    • 1...Qxf5
      • 2.Bxg3#
      • 2.d3#
    • 1...Qe6
      • 2.Bxg3#
      • 2.d3#
      • 2.d4#
    • 1...Qe7
      • 2.Bxg3#
      • 2.d3#
      • 2.d4#
    • 1...Qe8
      • 2.Bxg3#
      • 2.d3#
      • 2.d4#
  • Tries
    • 1.Re2+?
      • 1...Kg1
        • 2.Qc1#
        • 2.Qb1#
      • 1...Kh1
        • 2.Qc1#
        • 2.Qb1#
      • 1...g2!
    • 1.Rxg3?
      • threat
        • 2.Rxh3#
      • 1...Qc3+
        • 2.dxc3#
      • 1...Qxg3
        • 2.d3#
        • 2.d4#
      • 1...Qxe3
        • 2.dxe3#
      • 1...Qxf5
        • 2.Rg2#
        • 2.d3#
      • 1...Kxg3!
    • 1.d3+?
      • 1...Qxb2
        • 2.Bxg3#
      • 1...g2!
  • Keys
    • 1.Rh8!
      • threat
        • 2.Rxh3#
      • 1...Qc3+
        • 2.dxc3#
      • 1...Qxh8
        • 2.d4#
      • 1...Qxe3
        • 2.dxe3#
      • 1...Qxf5
        • 2.d3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 3
  • Sets
    • Q(f);OGATE,P_SPINP(b),XQ(B)::B(H),XP(b)
    • Q(f);CHECK,OGATE,P_SPINP(b)::QAR(B)+P(C),XQ(f)
    • Q(f);OGATE,P_SPINP(b)::B(H),XP(b)
    • Q(f);P_SPINP(b)::QAR(B)+P(C)
    • Q(f);OGATE,P_SPINP(b),XS(D)::QAR(B)+P(C),XQ(f)
  • Tries
    • Try
      • R(A);CHECK
      • Refutation
        • P(b);P_SPINP(b),P_SPINQ(f)
    • Try
      • R(I);XP(b)
      • Threat
        • R1(I),XP(c)
      • Vars
        • Q(f);CHECK,OGATE::QAR(B)+P(C),XQ(f)
        • Q(f);OGATE,XS(D)::QAR(B)+P(C),XQ(f)
      • Refutation
        • K(a);P_SPINQ(f),S_FLIGHT,XR(I)
    • Try
      • P(C);CHECK
      • Vars
        • Q(f);OGATE,P_SPINP(b),XQ(B)::B(H),XP(b)
      • Refutation
        • P(b);P_SPINP(b),P_SPINQ(f)
  • Actual
    • R(I);P_PINP(c)
    • Threat
      • R1(I),XP(c)
    • Vars
      • Q(f);CHECK,N_SPINP(c),OGATE,P_SPINP(b)::QAR(B)+P(C),XQ(f)
      • Q(f);N_SPINP(c),P_SPINP(b),XR(I)::QAR(B)+P(C)
      • Q(f);N_SPINP(c),OGATE,P_SPINP(b),XS(D)::QAR(B)+P(C),XQ(f)
      • Q(f);N_GUARD,N_SPINP(c),P_SPINP(b),XB(G)::QAR(B)+P(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).