MESON Chess Problem Database

Problem Display
PID: 189632 (1K6/1Q6/1pB5/8/8/8/2q3Rp/7k w - - 0 1)

Ferber, Eugene

Deutsche Schachzeitung, 1911

1K6/1Q6/1pB5/8/8/8/2q3Rp/7k

#2

4 + 4

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qg6
      • 2.Rxg6#
    • 1...Qh7
      • 2.Rg6#
  • Tries
    • 1.Rg3+?
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qg2!
    • 1.Rg4+?
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qg2!
    • 1.Rg5+?
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qg2!
    • 1.Rg6+?
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qg2!
    • 1.Rg7+?
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qg2!
    • 1.Rg8+?
      • 1...Qe4
        • 2.Bxe4#
      • 1...Qxc6
        • 2.Qxc6#
      • 1...Qg2!
    • 1.Qc7?
      • threat
        • 2.Qxh2#
      • 1...Qh7
        • 2.Rg6#
      • 1...Qxg2!
  • Keys
    • 1.Qh7!
      • threat
        • 2.Qxh2#
      • 1...Qxh7
        • 2.Rg6#
      • 1...Qxg2
        • 2.Qb1#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • Q(b);N_GUARD::B(B)+R(A),XQ(b)
    • Q(b);N_GUARD::B(B)+R(A)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(B),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XB(B)::QAB(C),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(B),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XB(B)::QAB(C),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(B),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XB(B)::QAB(C),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(B),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XB(B)::QAB(C),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(B),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XB(B)::QAB(C),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • R(A);CHECK
      • Vars
        • Q(b);N_GUARD,P_SPINQ(b)::B(B),XQ(b)
        • Q(b);OGATE,P_SPINQ(b),XB(B)::QAB(C),XQ(b)
      • Refutation
        • Q(b);P_SPINQ(b)
    • Try
      • Q(C);
      • Threat
        • QAR1(C),XP(c)
      • Vars
        • Q(b);N_GUARD::B(B)+R(A)
      • Refutation
        • Q(b);P_SPINQ(b),XR(A)
  • Actual
    • Q(C);P_PINP(c)
    • Threat
      • QAR1(C),XP(c)
    • Vars
      • Q(b);N_GUARD,N_SPINP(c),XQ(C)::B(B)+R(A)
      • Q(b);OGATE,P_SPINQ(b),XR(A)::QAR(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).