MESON Chess Problem Database
Problem Display
PID: 21993 (8/Qp6/3nR3/2pP4/n2kpN2/3NpP2/2R5/2K3B1 w - - 0 1)
Lester, William Edward
2nd Prize, Brisbane Courier, 1923
#2
9 + 7
| 273 | Mat Plus | 1994 |
| 133 | The Problemist Supplement | 2006 |
SOLUTION
- SOUND
- Sets
- 1...Sb2
- 2.Qxc5#
- 1...Sc3
- 2.Qxc5#
- 1...Sb6
- 2.Qa1#
- 1...Sc4
- 2.Rxe4#
- 1...Sb5
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...exd3
- 2.Bxe3#
- 1...exf3
- 2.Bxe3#
- 1...b5
- 2.Qg7#
- 1...b6
- 2.Qg7#
- 1...Sb2
- Tries
- 1.Kb1?
- 1...exd3
- 2.Bxe3#
- 1...exf3
- 2.Bxe3#
- 1...Sb2
- 2.Qxc5#
- 1...Sb6
- 2.Qa1#
- 1...Sc4
- 2.Rxe4#
- 1...Sb5
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...b5
- 2.Qg7#
- 1...b6
- 2.Qg7#
- 1...Sc3+!
- 1...exd3
- 1.Se1?
- 1...exf3
- 2.Sxf3#
- 2.Bxe3#
- 1...Sb2
- 2.Qxc5#
- 1...Sb6
- 2.Qa1#
- 1...Sc4
- 2.Rxe4#
- 1...Sb5
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...b5
- 2.Qg7#
- 1...b6
- 2.Qg7#
- 1...Sc3!
- 1...exf3
- 1.Sb2?
- 1...Sxb2
- 2.Qxc5#
- 1...exf3
- 2.Bxe3#
- 1...Sc3
- 2.Rd2#
- 1...Sc4
- 2.Rxc4#
- 2.Rxe4#
- 1...Sb5
- 2.Rc4#
- 2.Rxe4#
- 1...Sf5
- 2.Rc4#
- 2.Rxe4#
- 1...Sf7
- 2.Rc4#
- 2.Rxe4#
- 1...Sc8
- 2.Rc4#
- 2.Rxe4#
- 1...Se8
- 2.Rc4#
- 2.Rxe4#
- 1...b5
- 2.Qg7#
- 1...b6
- 2.Qg7#
- 1...Sb6!
- 1...Sxb2
- 1.Sb4?
- threat
- 2.Se2#
- 1...exf3
- 2.Bxe3#
- 1...Sc3!
- threat
- 1.Sxc5?
- threat
- 2.Sb3#
- 1...Sxc5
- 2.Qxc5#
- 2.Qa1#
- 1...Sc3!
- threat
- 1.Bf2?
- 1...exd3
- 2.Bxe3#
- 1...exf3
- 2.Bxe3#
- 1...Sc3
- 2.Qxc5#
- 1...Sb2
- 2.Qxc5#
- 1...Sb6
- 2.Qa1#
- 1...Sc4
- 2.Rxe4#
- 1...Sb5
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...b5
- 2.Qg7#
- 1...b6
- 2.Qg7#
- 1...exf2!
- 1...exd3
- 1.Re8?
- 1...exd3
- 2.Bxe3#
- 1...exf3
- 2.Bxe3#
- 1...Sc3
- 2.Qxc5#
- 1...b5
- 2.Qg7#
- 1...Sb2
- 2.Qxc5#
- 1...Sb6
- 2.Qa1#
- 1...Sc4
- 2.Rxe4#
- 1...Sb5
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...b6
- 2.Qg7#
- 1...Sxe8!
- 1...exd3
- 1.Qb6?
- 1...exd3
- 2.Bxe3#
- 1...exf3
- 2.Bxe3#
- 1...Sc3
- 2.Qxc5#
- 1...Sb2
- 2.Qxc5#
- 2.Qxb2#
- 1...Sc4
- 2.Rxe4#
- 1...Sb5
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...Sxb6!
- 1...exd3
- 1.Qb8?
- threat
- 2.Qh8#
- 1...Sc4
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 2.Qe5#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 2.Qe5#
- 1...Se8
- 2.Rxe4#
- 2.Qe5#
- 1...Sc3!
- threat
- 1.Qxa4+?
- 1...Sc4
- 2.Rxc4#
- 2.Rxe4#
- 2.Qxc4#
- 1...c4!
- 1...Sc4
- 1.Qxb7?
- threat
- 2.Qg7#
- 1...Sxb7
- 2.Rxe4#
- 1...Sc4
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...Sc3!
- threat
- 1.Qa8?
- threat
- 2.Qh8#
- 1...Sc4
- 2.Rxe4#
- 1...Sf5
- 2.Rxe4#
- 1...Sf7
- 2.Rxe4#
- 1...Sc8
- 2.Rxe4#
- 1...Se8
- 2.Rxe4#
- 1...Sc3!
- threat
- 1.Kb1?
- Keys
- 1.Se5!
- 1...exf3
- 2.Sxf3#
- 1...Sb2
- 2.Qxc5#
- 1...Sc3
- 2.Rd2#
- 1...Sb6
- 2.Qa1#
- 1...Sc4
- 2.Rxc4#
- 1...Sb5
- 2.Rc4#
- 1...Sf5
- 2.Rc4#
- 1...Sf7
- 2.Rc4#
- 1...Sc8
- 2.Rc4#
- 1...Se8
- 2.Rc4#
- 1...b5
- 2.Sc6#
- 1...b6
- 2.Sc6#
- 1...exf3
- 1.Se5!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 10
- ADDED MATES = 0
- REMOVED MATES = 1
- Sets
- S(b);N_GUARD::QAB1(I),XP(e)
- S(b);OGATE::QAB(I)
- S(f);N_GUARD::R1(H),XP(d)
- P(d);XS(D)::B(B),XP(a)
- P(d);XP(E)::B(B),XP(a)
- P(g);OGATE::QAB(I)
- Tries
- Try
- K(A);P-FLIGHT
- Vars
- P(d);XS(D)::B(B),XP(a)
- P(d);XP(E)::B(B),XP(a)
- S(b);N_GUARD::QAB1(I),XP(e)
- S(b);OGATE::QAB(I)
- S(f);N_GUARD::R1(H),XP(d)
- P(g);OGATE::QAB(I)
- Refutation
- S(b);CHECK
- Try
- S(D);
- Vars
- S(b);N_GUARD::QAB1(I),XP(e)
- S(b);OGATE::QAB(I)
- S(f);N_GUARD::R1(H),XP(d)
- P(g);OGATE::QAB(I)
- Refutation
- S(b);
- Try
- S(D);
- Vars
- S(b);N_GUARD,XS(D)::QAB1(I),XP(e)
- P(d);XP(E)::B(B),XP(a)
- S(b);SBLOCK::R(C)
- P(g);OGATE::QAB(I)
- Refutation
- S(b);
- Try
- S(D);
- Threat
- S(F)
- Vars
- P(d);XP(E)::B(B),XP(a)
- Refutation
- S(b);
- Try
- S(D);XP(e)
- Threat
- QAB(I)+S(D),DCHECK
- Refutation
- S(b);
- Try
- B(B);
- Vars
- P(d);XS(D)::B(B),XP(a)
- P(d);XP(E)::B(B),XP(a)
- S(b);N_GUARD::QAB1(I),XP(e)
- S(b);OGATE::QAB(I)
- S(f);N_GUARD::R1(H),XP(d)
- P(g);OGATE::QAB(I)
- Refutation
- P(a);N_SPINP(a),P_SPINP(e),XB(B)
- Try
- R(H);
- Vars
- P(d);XS(D)::B(B),XP(a)
- P(d);XP(E)::B(B),XP(a)
- S(b);N_GUARD::QAB1(I),XP(e)
- P(g);OGATE::QAB(I)
- S(b);OGATE::QAB(I)
- S(f);N_GUARD::R1(H),XP(d)
- Refutation
- S(f);XR(H)
- Try
- Q(I);
- Vars
- P(d);XS(D)::B(B),XP(a)
- P(d);XP(E)::B(B),XP(a)
- S(b);N_GUARD::QAB1(I),XP(e)
- S(f);N_GUARD::R1(H),XP(d)
- Refutation
- S(b);XQ(I)
- Try
- Q(I);
- Threat
- QAB(I)
- Vars
- S(f);N_GUARD::R1(H),XP(d)
- Refutation
- S(b);
- Try
- Q(I);CHECK,XS(b)
- Refutation
- P(e);
- Try
- Q(I);XP(g)
- Threat
- QAB(I)
- Vars
- S(f);N_GUARD,XQ(I)::R1(H),XP(d)
- S(f);N_GUARD::R1(H),XP(d)
- Refutation
- S(b);
- Try
- Q(I);
- Threat
- QAB(I)
- Vars
- S(f);N_GUARD::R1(H),XP(d)
- Refutation
- S(b);
- Try
- Actual
- S(D);
- Vars
- P(d);XP(E)::S(D),XP(d)
- S(b);N_GUARD::QAB1(I),XP(e)
- S(b);SBLOCK::R(C)
- S(b);OGATE::QAB(I)
- S(f);N_GUARD::R1(C),XS(f)
- S(f);N_GUARD::R1(C)
- P(g);N_GUARD::S(D)
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