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Problem Display

PID: 272520 (2K3b1/3p4/N7/8/P1kb4/1p3Q1p/1P1R1qr1/n5BB w - - 0 1)

Otto, Max

Die Schwalbe, 1932

2K3b1/3p4/N7/8/P1kb4/1p3Q1p/1P1R1qr1/n5BB

#2

8 + 9

SOLUTION

SOUND
Sets
- 1...Qe1
  - 2.Rxd4#
- 1...Qg3
  - 2.Rxd4#
- 1...Qf1
  - 2.Rxd4#
- 1...Qe2
  - 2.Rxd4#
- 1...Qxf3
  - 2.Rxd4#
- 1...Rxg1
  - 2.Qd3#
- 1...Rh2
  - 2.Qd3#
- 1...Rg4
  - 2.Qd3#
- 1...Rg5
  - 2.Qd3#
- 1...Rg6
  - 2.Qd3#
- 1...Rg7
  - 2.Qd3#
- 1...Bxb2
  - 2.Qd3#
- 1...Bc3
  - 2.Qxc3#
  - 2.Qd3#
- 1...Bc5
  - 2.Qc3#
  - 2.Qd3#
- 1...Be5
  - 2.Qd3#
- 1...Bb6
  - 2.Qc3#
  - 2.Qd3#
- 1...Bf6
  - 2.Qd3#
- 1...Ba7
  - 2.Qc3#
  - 2.Qd3#
- 1...Bg7
  - 2.Qd3#
- 1...Bh8
  - 2.Qd3#
- 1...Bd5
  - 2.Qd3#
- 1...d5
  - 2.Qd3#
Tries
- 1.Bxf2?
  - threat
    - 2.Rxd4#
  - 1...Rxf2
    - 2.Qd3#
  - 1...Bxb2
    - 2.Qd3#
  - 1...Bxf2
    - 2.Qe2#
    - 2.Qc3#
    - 2.Qd3#
  - 1...Rg4
    - 2.Qe2#
    - 2.Qd3#
  - 1...Bc3
    - 2.Qe2#
    - 2.Qxc3#
    - 2.Qd3#
  - 1...Be3
    - 2.Qe2#
  - 1...Bc5
    - 2.Qe2#
    - 2.Qc3#
    - 2.Qd3#
  - 1...Be5
    - 2.Qe2#
    - 2.Qd3#
  - 1...Bb6
    - 2.Qe2#
    - 2.Qc3#
    - 2.Qd3#
  - 1...Bf6
    - 2.Qe2#
    - 2.Qd3#
  - 1...Ba7
    - 2.Qe2#
    - 2.Qc3#
    - 2.Qd3#
  - 1...Bg7
    - 2.Qe2#
    - 2.Qd3#
  - 1...Bh8
    - 2.Qe2#
    - 2.Qd3#
  - 1...Sc2!
- 1.Qe2+?
  - 1...Qxe2
    - 2.Rxd4#
  - 1...Kd5!
- 1.Qc6+?
  - 1...Bc5
    - 2.Qb5#
  - 1...dxc6!
Keys
- 1.Qf5!
  - threat
    - 2.Qb5#
  - 1...Qxf5
    - 2.Rxd4#
  - 1...Bxb2
    - 2.Qd3#
  - 1...Rg5
    - 2.Qd3#
  - 1...Bc5
    - 2.Qd3#
  - 1...Be5
    - 2.Qd3#
  - 1...Bd5
    - 2.Qd3#
  - 1...d5
    - 2.Qd3#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 2
- REMOVED MATES = 13
Sets
- Q(b);N_GUARD::R1(D),XB(g)
- Q(b);N_GUARD,XQ(E)::R1(D),XB(g)
- R(c);XB(A)::QAB1(E)
- R(c);::QAB1(E)
- B(g);XP(C)::QAB1(E)
- B(g);::QAB1(E)
- B(i);SBLOCK::QAB1(E)
- P(h);SBLOCK::QAB1(E)
Tries
- Try
  - B(A);XQ(b)
  - Threat
    - R1(D),XB(g)
  - Vars
    - R(c);XB(A)::QAB1(E)
    - B(g);XP(C)::QAB1(E)
    - B(g);::QAB(E)
  - Refutation
    - S(a);
- Try
  - Q(E);CHECK
  - Vars
    - Q(b);XQ(E)::R1(D),XB(g)
  - Refutation
    - K(f);P_SPINB(g),P_SPINR(c),S_FLIGHT
- Try
  - Q(E);CHECK
  - Vars
    - B(g);P_SPINB(g)::QAB1(E)
  - Refutation
    - P(h);XQ(E)
Actual
- Q(E);
- Threat
  - QAB1(E)
- Vars
  - Q(b);N_GUARD,XQ(E)::R1(D),XB(g)
  - B(g);XP(C)::QAB1(E)
  - R(c);::QAB1(E)
  - B(g);::QAB1(E)
  - B(i);SBLOCK::QAB1(E)
  - P(h);SBLOCK::QAB1(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).