MESON Chess Problem Database

Problem Display
PID: 260945 (3r1q1b/p3rP2/K5P1/pRPkN2R/3N4/3Q2p1/3p4/5nn1 w - - 0 1)

Johner, Hans

Neue Zurcher Zeitung, 1940

3r1q1b/p3rP2/K5P1/pRPkN2R/3N4/3Q2p1/3p4/5nn1

#2

9 + 11

6490 yacpdb 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Re6+
      • 2.Sdc6#
    • 1...Rd6+
      • 2.c6#
  • Tries
    • 1.Sc4+?
      • 1...Be5
        • 2.c6#
      • 1...Re5!
    • 1.Sg4+?
      • 1...Be5
        • 2.Sf6#
      • 1...Re5!
    • 1.Sd7+?
      • 1...Be5
        • 2.Sf6#
      • 1...Re5!
    • 1.Qb3+?
      • 1...Kxd4
        • 2.Qd3#
      • 1...Ke4!
    • 1.Qf3+?
      • 1...Kxd4
        • 2.Qd3#
      • 1...Sxf3!
  • Keys
    • 1.Rh4!
      • threat
        • 2.Qe4#
      • 1...Re6+
        • 2.Sdc6#
      • 1...Rd6+
        • 2.c6#
      • 1...Kxe5
        • 2.Qf5#
      • 1...Rxe5
        • 2.Qb3#
      • 1...Bxe5
        • 2.Qb3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(h);CHECK,SBLOCK::QAR(A)+S(B)
    • R(i);CHECK,SBLOCK::R(C)+P(D)
  • Tries
    • Try
      • S(E);CHECK
      • Vars
        • B(k);P_SPINB(k)::R(C)+P(D)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • S(E);CHECK
      • Vars
        • B(k);P_SPINB(k)::S(E)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • S(E);CHECK
      • Vars
        • B(k);P_SPINB(k)::S(E)
      • Refutation
        • R(h);P_SPINR(h)
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
      • Refutation
        • K(f);S_FLIGHT
    • Try
      • Q(A);CHECK
      • Vars
        • K(f);OGATEB,P-FLIGHT,XS(B)::QAR1(A)
      • Refutation
        • S(b);XQ(A)
  • Actual
    • R(F);
    • Threat
      • QAB1(A)
    • Vars
      • R(h);CHECK,SBLOCK::QAR(A)+S(B)
      • R(i);CHECK,SBLOCK::R(C)+P(D)
      • K(f);OGATEB,P-FLIGHT,XS(E)::QAR1(A)
      • R(h);SBLOCK,XS(E)::QAB(A)
      • B(k);SBLOCK,XS(E)::QAB(A)
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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).