MESON Chess Problem Database

Problem Display
PID: 140080 (1r3R2/4p2p/Q6n/n2pN3/R1q1k3/4P3/N1PK3B/bB6 w - - 0 1)

Rothstein, Louis

1st HM.=, Good Companions (January), 1924

1r3R2/4p2p/Q6n/n2pN3/R1q1k3/4P3/N1PK3B/bB6

#2

10 + 9

56 The Problemist 1938

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa4
      • 2.Qd3#
    • 1...Qb4+
      • 2.c3#
    • 1...Qd4+
      • 2.Qd3#
    • 1...Rb2
      • 2.Sc3#
    • 1...Rb3
      • 2.cxb3#
    • 1...Ra8
      • 2.c3#
    • 1...Rc8
      • 2.c3#
    • 1...Rd8
      • 2.c3#
    • 1...Re8
      • 2.c3#
    • 1...Rxf8
      • 2.c3#
    • 1...Bb2
      • 2.c3#
    • 1...Bc3+
      • 2.Sxc3#
    • 1...Sb3+
      • 2.cxb3#
    • 1...Sb7
      • 2.c3#
  • Tries
    • 1.Qg6+?
      • 1...Sf5
        • 2.Qxf5#
        • 2.Qg2#
        • 2.Qg4#
      • 1...hxg6!
  • Keys
    • 1.Qe6!
      • threat
        • 2.Rf4#
      • 1...Qb4+
        • 2.c3#
      • 1...Qd4+
        • 2.Sd3#
      • 1...Bc3+
        • 2.Sxc3#
      • 1...Sb3+
        • 2.cxb3#
      • 1...Rxf8
        • 2.c3#
      • 1...Sf5
        • 2.Qxf5#
      • 1...Sf7
        • 2.Qg4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 9
  • Sets
    • Q(b);N_SPINQ(b),OGATE,XR(G)::QAB1(I)
    • Q(b);CHECK,S_CUTR(i)::B(A)+P(C)
    • Q(b);CHECK,OGATE::QAB1(I)
    • R(i);P_PINP(C),S_CUTB(a)::S(B)
    • R(i);OGATE::B(A)+P(C),XR(i)
    • R(i);N_GUARD::B(A)+P(C)
    • R(i);N_GUARD,XR(J)::B(A)+P(C)
    • B(a);S_CUTR(i)::B(A)+P(C)
    • B(a);CHECK,N_GUARD::S(B),XB(a)
    • S(d);CHECK,OGATE::B(A)+P(C),XS(d)
    • S(d);S_CUTR(i)::B(A)+P(C)
  • Tries
    • Try
      • Q(I);CHECK
      • Refutation
        • P(h);XQ(I)
  • Actual
    • Q(I);
    • Threat
      • R1(J)
    • Vars
      • Q(b);CHECK,S_CUTR(i)::B(A)+P(C)
      • Q(b);CHECK,S_CUTB(a)::QAR(I)+S(H)
      • B(a);CHECK,N_GUARD::S(B),XB(a)
      • S(d);CHECK,OGATE::B(A)+P(C),XS(d)
      • R(i);N_GUARD,XR(J)::B(A)+P(C)
      • S(f);N_GUARD::QAB1(I),XS(f)
      • S(f);N_GUARD::QAR2(I)
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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).