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Problem Display

PID: 235242 (8/1p4q1/1KPN4/1NPk1r2/4R3/1p1P3B/6n1/8 w - - 0 1)

Heyl, Peter

Schach, 2008

8/1p4q1/1KPN4/1NPk1r2/4R3/1p1P3B/6n1/8

#2

8 + 6

15148	Sadier Collection	2021

SOLUTION

SOUND
Sets
- 1...Qa1
  - 2.Sc7#
- 1...Qb2
  - 2.Sc7#
- 1...Qc3
  - 2.Sxc3#
  - 2.Sc7#
- 1...Qd4
  - 2.Sc7#
- 1...Qe5
  - 2.Sc7#
- 1...Qf6
  - 2.Sc7#
- 1...Qh6
  - 2.Sc3#
  - 2.Sc7#
- 1...Qf8
  - 2.Sc3#
  - 2.Sc7#
- 1...Qh8
  - 2.Sc7#
- 1...Qg3
  - 2.Sc3#
  - 2.Sc7#
- 1...Qg4
  - 2.Sc3#
  - 2.Sc7#
- 1...Qg5
  - 2.Sc3#
  - 2.Sc7#
- 1...Qg6
  - 2.Sc3#
  - 2.Sc7#
- 1...Qc7+
  - 2.Sxc7#
- 1...Qd7
  - 2.Sc3#
- 1...Qe7
  - 2.Sc3#
- 1...Qf7
  - 2.Sc3#
- 1...Qh7
  - 2.Sc3#
- 1...Qg8
  - 2.Sc3#
  - 2.Sc7#
- 1...Rf1
  - 2.Be6#
- 1...Rf2
  - 2.Be6#
- 1...Rf3
  - 2.Be6#
- 1...Rf4
  - 2.Be6#
- 1...Re5
  - 2.Sc3#
  - 2.Rd4#
- 1...Rg5
  - 2.Be6#
- 1...Rh5
  - 2.Be6#
- 1...Rf6
  - 2.Sc3#
- 1...Rf7
  - 2.Be6#
- 1...Rf8
  - 2.Be6#
Tries
- 1.Sf7?
  - threat
    - 2.Sc7#
  - 1...Qxf7
    - 2.Sc3#
  - 1...Rxf7
    - 2.Be6#
  - 1...Qg3
    - 2.Sc3#
  - 1...Qe5!
- 1.Bxf5?
  - threat
    - 2.Be6#
  - 1...Qc7+
    - 2.Sxc7#
  - 1...Qe5
    - 2.Sc7#
  - 1...Qf6
    - 2.Sc7#
  - 1...Qh6
    - 2.Sc3#
    - 2.Sc7#
  - 1...Qg4
    - 2.Sc3#
    - 2.Sc7#
  - 1...Qg6
    - 2.Sc3#
    - 2.Sc7#
  - 1...Qd7
    - 2.Sc3#
  - 1...Qe7
    - 2.Sc3#
  - 1...Qf7
    - 2.Sc3#
  - 1...Qg8
    - 2.Sc3#
    - 2.Sc7#
  - 1...Sf4!
Keys
- 1.d4!
  - threat
    - 2.Sc3#
  - 1...Qc7+
    - 2.Sxc7#
  - 1...Qxd4
    - 2.Sc7#
  - 1...Qe5
    - 2.Sc7#
  - 1...Qg3
    - 2.Sc7#
  - 1...Rf3
    - 2.Be6#

FEATURES

Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 16
Sets
- Q(f);N_GUARD::S(D)
- Q(f);N_GUARD,P_PINP(E)::S(D)
- Q(f);CHECK,N_GUARD::S(D),XQ(f)
- R(d);OGATE::B(B)
- R(d);S_CUTQ(f)::S(D)
Tries
- Try
  - S(H);
  - Threat
    - S(D)
  - Vars
    - Q(f);N_GUARD,XS(H)::S(D)
    - R(d);OGATE,XS(H)::B(B)
    - Q(f);N_GUARD::S(D)
  - Refutation
    - Q(f);
- Try
  - B(B);XR(d)
  - Threat
    - B(B)
  - Vars
    - Q(f);CHECK,N_GUARD::S(D),XQ(f)
    - Q(f);N_GUARD::S(D)
  - Refutation
    - S(a);
Actual
- P(A);
- Threat
  - S(D)
- Vars
  - Q(f);CHECK,N_GUARD::S(D),XQ(f)
  - Q(f);N_GUARD,P_PINP(E),XP(A)::S(D)
  - Q(f);N_GUARD::S(D)
  - R(d);OGATE::B(B)

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