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Problem Display

PID: 72030 (7r/P1b5/pp1B4/5R2/4kpN1/1pK1Nn2/6n1/rb5Q w - - 0 1)

Forster, Klaus

Die Schwalbe, 2006

7r/P1b5/pp1B4/5R2/4kpN1/1pK1Nn2/6n1/rb5Q

#2

7 + 11

SOLUTION

SOUND
Sets
- 1...Ra3
  - 2.Qxb1#
- 1...Ra4
  - 2.Qxb1#
- 1...Ra5
  - 2.Qxb1#
- 1...Rxh1
  - 2.a8Q#
  - 2.a8B#
- 1...Rh2
  - 2.a8Q#
  - 2.a8B#
- 1...Rh3
  - 2.a8Q#
  - 2.a8B#
- 1...Rh4
  - 2.a8Q#
  - 2.a8B#
- 1...Rh5
  - 2.a8Q#
  - 2.a8B#
- 1...Rh6
  - 2.a8Q#
  - 2.a8B#
- 1...Rh7
  - 2.a8Q#
  - 2.a8B#
- 1...Bb8
  - 2.a8Q#
  - 2.a8B#
- 1...Bd8
  - 2.a8Q#
  - 2.a8B#
- 1...Sge1
  - 2.Rxf4#
  - 2.Re5#
- 1...Sxe3
  - 2.Re5#
- 1...Sgh4
  - 2.Rxf4#
  - 2.Re5#
- 1...Sfe1
  - 2.Rxf4#
- 1...Sg1
  - 2.Rxf4#
- 1...Sd2
  - 2.Rxf4#
- 1...Sh2
  - 2.Rxf4#
- 1...Sd4
  - 2.Rxf4#
- 1...Sfh4
  - 2.Rxf4#
- 1...Sg5
  - 2.Rxf4#
Tries
- 1.Qxg2?
  - threat
    - 2.Rxf4#
    - 2.Re5#
  - 1...fxe3
    - 2.Qxf3#
  - 1...Ra5
    - 2.Rxf4#
  - 1...Rh5
    - 2.Rxf4#
    - 2.a8Q#
    - 2.a8B#
  - 1...Re8
    - 2.Rxf4#
  - 1...Rf8
    - 2.Re5#
  - 1...Bxd6!
- 1.Qh7?
  - threat
    - 2.Rxf4#
    - 2.Re5#
  - 1...Rxh7
    - 2.a8Q#
    - 2.a8B#
  - 1...Bxd6
    - 2.Re5#
    - 2.Qb7#
  - 1...Sxe3
    - 2.Sf2#
    - 2.Sf6#
    - 2.Re5#
  - 1...fxe3
    - 2.Sf6#
  - 1...Sfe1
    - 2.Rxf4#
  - 1...Sg1
    - 2.Rxf4#
  - 1...Sd2
    - 2.Rxf4#
  - 1...Sh2
    - 2.Rxf4#
  - 1...Sd4
    - 2.Rxf4#
  - 1...Sfh4
    - 2.Rxf4#
  - 1...Sg5
    - 2.Rxf4#
  - 1...Se5!
Keys
- 1.Qd1!
  - threat
    - 2.Qd5#
  - 1...Sxe3
    - 2.Rxf4#
  - 1...Ra5
    - 2.Qxb1#
  - 1...Bd3
    - 2.Qxd3#
  - 1...Sd2
    - 2.Re5#
  - 1...Sd4
    - 2.Re5#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 3
- ADDED MATES = 1
- REMOVED MATES = 7
Sets
- R(a);N_GUARD::QAB(A),XB(b)
- R(k);N_GUARD,XQ(A)::P=Q
- R(k);N_GUARD::P=Q
- B(j);S_CUTR(k)::P=Q
- S(c);P_SPINS(e),XS(C)::R1(E)
- S(e);P_SPINS(c)::R1(E),XP(g)
Tries
- Try
  - Q(A);P_PINS(e),XS(c)
  - Threat
    - DUALS(2)
  - Vars
    - P(g);XS(C)::QAB1(A),XS(e)
    - R(a);::R1(E),XP(g)
    - R(k);::R1(E),XP(g)
    - R(k);::R1(E)
  - Refutation
    - B(j);XB(F)
- Try
  - Q(A);
  - Threat
    - DUALS(2)
  - Vars
    - R(k);N_GUARD,XQ(A)::P=Q
    - P(g);SBLOCK,XS(C)::S(D)
    - S(e);::QAB(A)+R(E),DCHECK,XP(g)
  - Refutation
    - S(e);
Actual
- Q(A);
- Threat
  - QAB1(A)
- Vars
  - S(c);N_GUARD,XS(C)::R1(E),XP(g)
  - R(a);N_GUARD::QAB(A),XB(b)
  - B(b);N_GUARD::QAB1(A),XB(b)
  - S(e);N_GUARD::R1(E)

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).