MESON Chess Problem Database

Problem Display
PID: 247268 (8/p2BNkp1/Pp1PR1Nb/1K3Prp/5QpB/5pP1/5P2/8 w - - 0 1)

Usath, Walter

Die Schwalbe, 1929

8/p2BNkp1/Pp1PR1Nb/1K3Prp/5QpB/5pP1/5P2/8

#2

12 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Rxf5+
      • 2.Qxf5#
    • 1...Rxg6
      • 2.fxg6#
  • Tries
    • 1.Ka4?
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...b5+!
    • 1.Kb4?
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...b5!
    • 1.Kc4?
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...b5+!
    • 1.Kc6?
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...b5!
    • 1.Bc6?
      • 1...Rxf5+
        • 2.Qxf5#
      • 1...Rxg6!
    • 1.Re1?
      • 1...Rxf5+
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...Kf6!
    • 1.Re3?
      • 1...Rxf5+
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...Kf6!
    • 1.Re4?
      • 1...Rxf5+
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...Kf6!
    • 1.Re5?
      • 1...Rxf5
        • 2.Rxf5#
        • 2.Qc4#
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...Kf6!
    • 1.Qe5?
      • 1...Rxf5
        • 2.Qxf5#
      • 1...Rxg6!
    • 1.Qxf3?
      • 1...Rxf5+
        • 2.Qxf5#
      • 1...Rxg6
        • 2.fxg6#
      • 1...gxf3!
    • 1.Qe4?
      • 1...Rxf5+
        • 2.Qxf5#
      • 1...Rxg6!
  • Keys
    • 1.Qc4!
      • 1...Rxf5+
        • 2.Re5#
      • 1...Rxg6
        • 2.Rf6#

FEATURES

  • Static
    • TYPE = MUTATE
    • CHANGED MATES = 2
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • R(c);CHECK,OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
    • R(c);N_PINP(F),XS(J)::QAR(C)+P(F)DCHECK,XR(c)
  • Tries
    • Try
      • K(E);N_SPINP(F),S_FLIGHT
      • Vars
        • R(c);OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);OGATE,XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • P(e);CHECK
    • Try
      • K(E);N_SPINP(F),P-FLIGHT
      • Vars
        • R(c);OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);OGATE,XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • P(e);
    • Try
      • K(E);N_SPINP(F),S_FLIGHT
      • Vars
        • R(c);OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);OGATE,XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • P(e);CHECK
    • Try
      • K(E);N_SPINP(F),S_FLIGHT
      • Vars
        • R(c);OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);OGATE,XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • P(e);
    • Try
      • B(K);
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
      • Refutation
        • R(c);N_PINP(F),XS(J)
    • Try
      • R(I);
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);N_PINP(F),XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • K(h);P-FLIGHT,P_SPINR(c)
    • Try
      • R(I);
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);N_PINP(F),XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • K(h);P-FLIGHT,P_SPINR(c)
    • Try
      • R(I);
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);N_PINP(F),XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • K(h);P-FLIGHT,P_SPINR(c)
    • Try
      • R(I);N_SPINP(F)
      • Vars
        • R(c);OGATE,XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • K(h);P-FLIGHT,P_SPINR(c)
    • Try
      • Q(C);N_SPINP(F)
      • Vars
        • R(c);OGATE,P_PINQ(C),XP(F)::QAR2(C),XR(c)
      • Refutation
        • R(c);XS(J)
    • Try
      • Q(C);XP(a)
      • Vars
        • R(c);CHECK,OGATE,P_SPINR(c),XP(F)::QAR2(C),XR(c)
        • R(c);N_PINP(F),XS(J)::QAR(C)+P(F)DCHECK,XR(c)
      • Refutation
        • P(b);XQ(C)
    • Try
      • Q(C);
      • Vars
        • R(c);CHECK,OGATE,XP(F)::QAR2(C),XR(c)
      • Refutation
        • R(c);N_PINP(F),XS(J)
  • Actual
    • Q(C);
    • Vars
      • R(c);CHECK,XP(F)::QAB(C)+R(I)
      • R(c);N_PINP(F),XS(J)::QAB(C)+R(I),DCHECK
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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).