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Problem Display

PID: 198182 (2q5/B2NN2b/2nP4/1n2R1R1/1rk1p3/P1pr4/2P2bK1/5Q2 w - - 0 1)

Larsen, Karl Adolf Koefoed

Hampshire Telegraph and Post, 1920

2q5/B2NN2b/2nP4/1n2R1R1/1rk1p3/P1pr4/2P2bK1/5Q2

#2

10 + 10

6490	yacpdb	2019

SOLUTION

SOUND
Sets
- 1...Bd4
  - 2.Qf7#
- 1...Sbd4
  - 2.Rc5#
- 1...Scd4
  - 2.Sb6#
- 1...Sxe5
  - 2.Sxe5#
Tries
- 1.Bxf2?
  - threat
    - 2.Sb6#
    - 2.Rc5#
  - 1...Qxd7
    - 2.Rc5#
  - 1...Sxa3
    - 2.Rc5#
  - 1...Sxd6
    - 2.Rc5#
  - 1...Sxe5
    - 2.Sxe5#
    - 2.Sb6#
  - 1...Sxe7
    - 2.Sb6#
  - 1...Qa6
    - 2.Rc5#
  - 1...Qb7
    - 2.Rc5#
  - 1...Qc7
    - 2.Rc5#
  - 1...Qb8
    - 2.Rc5#
  - 1...Qd8
    - 2.Rc5#
  - 1...Sbd4
    - 2.Rc5#
  - 1...Sba7
    - 2.Rc5#
  - 1...Sc7
    - 2.Rc5#
  - 1...Scd4
    - 2.Sb6#
  - 1...Sa5
    - 2.Sb6#
  - 1...Sca7
    - 2.Sb6#
  - 1...Sb8
    - 2.Sb6#
  - 1...Sd8
    - 2.Sb6#
  - 1...e3!
- 1.Be3?
  - threat
    - 2.Sb6#
    - 2.Rc5#
  - 1...Qxd7
    - 2.Rc5#
  - 1...Sxa3
    - 2.Rc5#
  - 1...Sxd6
    - 2.Rc5#
  - 1...Sxe5
    - 2.Sxe5#
    - 2.Sb6#
  - 1...Sxe7
    - 2.Sb6#
  - 1...Qa6
    - 2.Rc5#
  - 1...Qb7
    - 2.Rc5#
  - 1...Qc7
    - 2.Rc5#
  - 1...Qb8
    - 2.Rc5#
  - 1...Qd8
    - 2.Rc5#
  - 1...Sbd4
    - 2.Rc5#
  - 1...Sba7
    - 2.Rc5#
  - 1...Sc7
    - 2.Rc5#
  - 1...Scd4
    - 2.Sb6#
  - 1...Sa5
    - 2.Sb6#
  - 1...Sca7
    - 2.Sb6#
  - 1...Sb8
    - 2.Sb6#
  - 1...Sd8
    - 2.Sb6#
  - 1...Bxe3!
- 1.Rxe4+?
  - 1...Bd4
    - 2.Sb6#
    - 2.Rc5#
    - 2.Qxd3#
    - 2.Qf7#
  - 1...Sbd4
    - 2.Rc5#
    - 2.Qxd3#
  - 1...Scd4
    - 2.Se5#
    - 2.Sb6#
    - 2.Qxd3#
  - 1...Bxe4+!
Keys
- 1.Rg4!
  - threat
    - 2.Qxd3#
  - 1...Sxe5
    - 2.Sxe5#
  - 1...Bd4
    - 2.Qf7#
  - 1...Sbd4
    - 2.Rc5#
  - 1...Scd4
    - 2.Sb6#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 0
- REMOVED MATES = 0
Sets
- B(a);OGATE::QAB(A)
- S(g);SBLOCK,S_CUTB(a)::R1(E)
- S(h);SBLOCK,S_CUTB(a)::S(I)
- S(h);XR(E)::S(I),XS(h)
Tries
- Try
  - B(H);XB(a)
  - Threat
    - DUALS(2)
  - Vars
    - Q(j);XS(I)::R1(E)
    - S(g);XP(D)::R1(E)
    - S(g);XP(G)::R1(E)
    - S(h);XS(J)::S(I)
    - Q(j);::R1(E)
    - S(g);::R1(E)
    - S(h);::S(I)
  - Refutation
    - P(f);
- Try
  - B(H);
  - Threat
    - DUALS(2)
  - Vars
    - Q(j);XS(I)::R1(E)
    - S(g);XP(D)::R1(E)
    - S(g);XP(G)::R1(E)
    - S(h);XS(J)::S(I)
    - Q(j);::R1(E)
    - S(g);::R1(E)
    - S(h);::S(I)
  - Refutation
    - B(a);XB(H)
- Try
  - R(E);CHECK,XP(f)
  - Refutation
    - B(i);CHECK,XR(E)
Actual
- R(F);P_PINP(f)
- Threat
  - QAB1(A),XR(c)
- Vars
  - S(h);XR(E)::S(I),XS(h)
  - B(a);N_SPINP(f),OGATE::QAB(A)
  - S(g);N_SPINP(f),SBLOCK,S_CUTB(a)::R1(E)
  - S(h);N_SPINP(f),SBLOCK,S_CUTB(a)::S(I)

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).