MESON Chess Problem Database

Problem Display
PID: 11623 (8/4K3/1p2BN2/1N1Pk1qQ/4p1pb/p1R2bP1/5rp1/B4r2 w - - 0 1)

Hoffmann, Fritz

Kolnische Rundschau, 1970

8/4K3/1p2BN2/1N1Pk1qQ/4p1pb/p1R2bP1/5rp1/B4r2

#2

9 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Qf5
      • 2.Qxf5#
    • 1...Bd1
      • 2.Rc2#
    • 1...Be2
      • 2.Rc1#
    • 1...Bxg3
      • 2.Qxg5#
    • 1...e3
      • 2.Rxe3#
  • Tries
    • 1.Kf7?
      • threat
        • 2.Sd7#
      • 1...Bxg3
        • 2.Qxg5#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Bd1
        • 2.Rc2#
      • 1...Be2
        • 2.Rc1#
      • 1...e3
        • 2.Rxe3#
      • 1...Qxh5+!
    • 1.Ke8?
      • threat
        • 2.Sd7#
      • 1...Kxf6
        • 2.Rxf3#
      • 1...Bxg3
        • 2.Qxg5#
      • 1...e3
        • 2.Rxe3#
      • 1...Qxh5+!
    • 1.Sa7?
      • threat
        • 2.Sc6#
      • 1...Kd4
        • 2.Sc6#
      • 1...Bxg3!
    • 1.Rxa3+?
      • 1...Rb2
        • 2.Bxb2#
      • 1...Rxa1!
  • Keys
    • 1.Kf8!
      • threat
        • 2.Sd7#
      • 1...Kxf6
        • 2.Rxf3#
      • 1...Bxg3
        • 2.Qxg5#
      • 1...Qf5
        • 2.Qxf5#
      • 1...Bd1
        • 2.Rc2#
      • 1...Be2
        • 2.Rc1#
      • 1...e3
        • 2.Rxe3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 0
  • Sets
    • Q(j);OGATE::QAR1(F),XQ(j)
    • B(e);S_CUTR(a)::B(A)+R(B)
    • B(e);S_CUTR(b)::B(A)+R(B)
    • B(h);N_GUARD,XP(C)::QAR2(F),XQ(j)
    • P(f);::B(A)+R(B),DCHECK,XP(f)
  • Tries
    • Try
      • K(I);N_SPINS(H),P-FLIGHT
      • Threat
        • S(H)
      • Vars
        • B(h);N_GUARD,XP(C)::QAR2(F),XQ(j)
        • Q(j);OGATE,P_PINS(H)::QAR1(F),XQ(j)
        • B(e);P_PINS(H),S_CUTR(a)::B(A)+R(B)
        • B(e);P_PINS(H),S_CUTR(b)::B(A)+R(B)
        • P(f);::B(A)+R(B),DCHECK,XP(f)
      • Refutation
        • Q(j);CHECK,N_SPINQ(j),XQ(F)
    • Try
      • K(I);N_SPINS(H),P-FLIGHT
      • Threat
        • S(H)
      • Vars
        • K(i);N_SPINQ(j),S_FLIGHT,XS(H)::B(A)+R(B),DCHECK,XB(e)
        • B(h);N_GUARD,XP(C)::QAR2(F),XQ(j)
        • P(f);::B(A)+R(B),DCHECK,XP(f)
      • Refutation
        • Q(j);CHECK,N_SPINQ(j),XQ(F)
    • Try
      • S(D);
      • Threat
        • S(D)
      • Vars
        • K(i);N_SPINQ(j),S_FLIGHT::S(D)
      • Refutation
        • B(h);XP(C)
    • Try
      • R(B);CHECK,XP(d)
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::B(A),XR(b)
      • Refutation
        • R(a);XB(A)
  • Actual
    • K(I);N_SPINS(H),S_FLIGHT
    • Threat
      • S(H)
    • Vars
      • K(i);N_SPINQ(j),S_FLIGHT,XS(H)::B(A)+R(B),DCHECK,XB(e)
      • B(h);N_GUARD,XP(C)::QAR2(F),XQ(j)
      • Q(j);OGATE,P_PINS(H)::QAR1(F),XQ(j)
      • B(e);P_PINS(H),S_CUTR(a)::B(A)+R(B)
      • B(e);P_PINS(H),S_CUTR(b)::B(A)+R(B)
      • P(f);::B(A)+R(B),DCHECK,XP(f)
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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).