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Problem Display

PID: 153346 (1Q1BK3/6Rb/4p1nq/1R2P2r/5k2/r1b3NP/4PP2/8 w - - 0 1)

Muller, Dieter

4th Comm., Wola Gulowska, 1989

1Q1BK3/6Rb/4p1nq/1R2P2r/5k2/r1b3NP/4PP2/8

#2

10 + 8

15345	Wola Gulowska Award	1989

SOLUTION

SOUND
Sets
- 1...Rh4
  - 2.Rf7#
- 1...Rxe5
  - 2.Rf7#
- 1...Bb4
  - 2.Rxb4#
- 1...Bxe5
  - 2.Rb4#
- 1...Sh4
  - 2.Rg4#
- 1...Sxe5
  - 2.Rg4#
- 1...Se7
  - 2.Rg4#
- 1...Sf8
  - 2.Rg4#
- 1...Sh8
  - 2.Rg4#
Tries
- 1.Rb4+?
  - 1...Bd4
    - 2.Rxd4#
  - 1...Bxb4!
- 1.Qa8?
  - threat
    - 2.Qf3#
    - 2.Qe4#
    - 2.e3#
  - 1...Rxh3
    - 2.Qf3#
    - 2.Qe4#
  - 1...Rxe5
    - 2.Qf3#
  - 1...Bxe5
    - 2.Qe4#
  - 1...Sxe5
    - 2.e3#
  - 1...Ra4
    - 2.Qf3#
    - 2.e3#
  - 1...Ba1
    - 2.Qe4#
  - 1...Be1
    - 2.Qe4#
  - 1...Bb2
    - 2.Qe4#
  - 1...Bd2
    - 2.Qe4#
  - 1...Bb4
    - 2.Qe4#
  - 1...Bd4
    - 2.Qe4#
  - 1...Ba5
    - 2.Qe4#
  - 1...Sh4
    - 2.Rg4#
    - 2.e3#
  - 1...Se7
    - 2.Rg4#
    - 2.Qf3#
    - 2.e3#
  - 1...Sf8
    - 2.Rg4#
    - 2.Qf3#
    - 2.e3#
  - 1...Sh8
    - 2.Rg4#
    - 2.Qf3#
    - 2.e3#
  - 1...Rxa8!
Keys
- 1.Qb7!
  - threat
    - 2.Qf3#
    - 2.Qe4#
    - 2.e3#
  - 1...Rxh3
    - 2.Qf3#
    - 2.Qe4#
  - 1...Rxe5
    - 2.Qf3#
  - 1...Bxe5
    - 2.Qe4#
  - 1...Sxe5
    - 2.e3#
  - 1...Ra4
    - 2.Qf3#
    - 2.e3#
  - 1...Ba1
    - 2.Qe4#
  - 1...Be1
    - 2.Qe4#
  - 1...Bb2
    - 2.Qe4#
  - 1...Bd2
    - 2.Qe4#
  - 1...Bb4
    - 2.Qe4#
  - 1...Bd4
    - 2.Qe4#
  - 1...Ba5
    - 2.Qe4#
  - 1...Sh4
    - 2.Rg4#
    - 2.e3#
  - 1...Se7
    - 2.Rg4#
    - 2.Qf3#
    - 2.e3#
  - 1...Sf8
    - 2.Rg4#
    - 2.Qf3#
    - 2.e3#
  - 1...Sh8
    - 2.Rg4#
    - 2.Qf3#
    - 2.e3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 4
- ADDED MATES = 6
- REMOVED MATES = 5
Sets
- R(d);N_GUARD::R(G)
- R(d);N_GUARD,P_SPINR(d),XP(F)::R(G)
- B(b);N_GUARD::R(E),XB(b)
- B(b);N_GUARD,P_SPINB(b),XP(F)::R(E)
- S(f);OGATE::R1(G)
- S(f);OGATE,P_SPINS(f),XP(F)::R1(G)
Tries
- Try
  - R(E);CHECK
  - Vars
    - B(b);N_GUARD,P_SPINB(b)::R(E),XB(b)
  - Refutation
    - B(b);XR(E)
- Try
  - Q(H);
  - Threat
    - DUALS(3)
  - Vars
    - R(d);XP(F)::QAR1(H)
    - B(b);XP(F)::QAR1(H)
    - S(f);XP(F)::P(A)
    - B(b);::QAR1(H)
  - Refutation
    - R(a);P_PINB(I),XQ(H)
Actual
- Q(H);
- Threat
  - DUALS(3)
- Vars
  - R(d);XP(F)::QAR1(H)
  - B(b);XP(F)::QAR1(H)
  - S(f);XP(F)::P(A)
  - B(b);::QAR1(H)

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).