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Problem Display

PID: 27195 (2K1B3/8/1N1P4/8/1pR5/k7/Pb6/Q7 w - - 0 1)

Lebeck, Donald

Mate in Two!! (Lebeck), 1992

2K1B3/8/1N1P4/8/1pR5/k7/Pb6/Q7

#2

7 + 3

SOLUTION

SOUND
Sets
- 1...b3
  - 2.Ra4#
Tries
- 1.Rc2?
  - threat
    - 2.Sc4#
    - 2.Qxb2#
  - 1...Bxa1
    - 2.Sc4#
  - 1...Bc1
    - 2.Sc4#
    - 2.Qxc1#
  - 1...Bc3
    - 2.Sc4#
  - 1...Bd4
    - 2.Sc4#
  - 1...Be5
    - 2.Sc4#
  - 1...Bf6
    - 2.Sc4#
  - 1...Bg7
    - 2.Sc4#
  - 1...Bh8
    - 2.Sc4#
  - 1...b3!
- 1.Rc3+?
  - 1...Bxc3
    - 2.Sc4#
  - 1...b3
    - 2.Rxb3#
  - 1...bxc3!
- 1.Rd4?
  - threat
    - 2.Sc4#
  - 1...b3
    - 2.Ra4#
  - 1...Bxa1!
- 1.Re4?
  - threat
    - 2.Sc4#
  - 1...b3
    - 2.Ra4#
  - 1...Bxa1!
- 1.Rf4?
  - threat
    - 2.Sc4#
  - 1...b3
    - 2.Ra4#
  - 1...Bxa1!
- 1.Rg4?
  - threat
    - 2.Sc4#
  - 1...b3
    - 2.Ra4#
  - 1...Bxa1!
- 1.Rh4?
  - threat
    - 2.Sc4#
  - 1...b3
    - 2.Ra4#
  - 1...Bxa1!
- 1.Qd1?
  - threat
    - 2.Qb3#
    - 2.Qa4#
  - 1...Ba1
    - 2.Qb3#
  - 1...Bc1
    - 2.Qb3#
  - 1...Bc3
    - 2.Qb3#
  - 1...Bd4
    - 2.Qb3#
  - 1...Be5
    - 2.Qb3#
  - 1...Bf6
    - 2.Qb3#
  - 1...Bg7
    - 2.Qb3#
  - 1...Bh8
    - 2.Qb3#
  - 1...b3
    - 2.Ra4#
    - 2.Qxb3#
  - 1...Kxa2!
Keys
- 1.Qb1!
  - 1...Bc1
    - 2.Qb3#
  - 1...Ba1
    - 2.Qb3#
  - 1...Bc3
    - 2.Qb3#
  - 1...Bd4
    - 2.Qb3#
  - 1...Be5
    - 2.Qb3#
  - 1...Bf6
    - 2.Qb3#
  - 1...Bg7
    - 2.Qb3#
  - 1...Bh8
    - 2.Qb3#
  - 1...b3
    - 2.Ra4#

FEATURES

Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 8
- REMOVED MATES = 0
Sets
- P(c);OGATE::R1(C)
Tries
- Try
  - R(C);
  - Threat
    - DUALS(2)
  - Vars
    - B(a);XQ(A)::S(D)
    - B(a);::S(D)
  - Refutation
    - P(c);
- Try
  - R(C);CHECK
  - Vars
    - B(a);XR(C)::S(D)
    - P(c);P_SPINP(c)::R1(C),XP(c)
  - Refutation
    - P(c);XR(C)
- Try
  - R(C);
  - Threat
    - S(D)
  - Vars
    - P(c);OGATE::R1(C)
  - Refutation
    - B(a);XQ(A)
- Try
  - R(C);
  - Threat
    - S(D)
  - Vars
    - P(c);OGATE::R1(C)
  - Refutation
    - B(a);XQ(A)
- Try
  - R(C);
  - Threat
    - S(D)
  - Vars
    - P(c);OGATE::R1(C)
  - Refutation
    - B(a);XQ(A)
- Try
  - R(C);
  - Threat
    - S(D)
  - Vars
    - P(c);OGATE::R1(C)
  - Refutation
    - B(a);XQ(A)
- Try
  - R(C);
  - Threat
    - S(D)
  - Vars
    - P(c);OGATE::R1(C)
  - Refutation
    - B(a);XQ(A)
- Try
  - Q(A);
  - Threat
    - DUALS(2)
  - Vars
    - B(a);::QAR1(A)
  - Refutation
    - K(b);P-FLIGHT,XP(B)
Actual
- Q(A);
- Vars
  - B(a);OGATE::QAR1(A)
  - P(c);OGATE::R1(C)

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