MESON Chess Problem Database
Problem Display
PID: 200042 (8/N5BK/8/2pp4/1qk1P3/pn3Q2/B4N2/5b2 w - - 0 1)
Dale, John
The Observer, 1947
(First published on Sun Aug 24 1947)
#2
7 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Qe1
- 2.Qxb3#
- 1...Qd2
- 2.Qxb3#
- 1...Qc3
- 2.Qxc3#
- 1...Qa5
- 2.Qxb3#
- 1...Qa4
- 2.Qc3#
- 1...Qb5
- 2.Qc3#
- 1...Qb6
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Be2
- 2.Qxe2#
- 1...Bg2
- 2.Qe2#
- 2.Qd3#
- 1...Bd3
- 2.Qxd3#
- 1...Bh3
- 2.Qe2#
- 2.Qd3#
- 1...dxe4
- 2.Qxe4#
- 2.Qf7#
- 1...Qe1
- Tries
- 1.Sd1?
- threat
- 2.Qxf1#
- 1...dxe4
- 2.Qxe4#
- 1...Qe1
- 2.Qxb3#
- 1...Qd2
- 2.Qxb3#
- 1...Qc3
- 2.Qxc3#
- 1...Qa5
- 2.Qxb3#
- 1...Qa4
- 2.Qc3#
- 1...Qb5
- 2.Qc3#
- 1...Qb6
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Be2
- 2.Qxe2#
- 1...Bg2
- 2.Qe2#
- 1...Bd3
- 2.Se3#
- 1...Bh3
- 2.Qe2#
- 1...d4!
- threat
- 1.Ba1?
- 1...dxe4
- 2.Qxe4#
- 2.Qf7#
- 1...Qe1
- 2.Qxb3#
- 1...Qd2
- 2.Qxb3#
- 1...Qc3
- 2.Qxc3#
- 1...Qa5
- 2.Qxb3#
- 1...Qa4
- 2.Qc3#
- 1...Qb5
- 2.Qc3#
- 1...Qb6
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...d4
- 2.Qf7#
- 1...Be2
- 2.Qxe2#
- 1...Bg2
- 2.Qe2#
- 2.Qd3#
- 1...Bd3
- 2.Qxd3#
- 1...Bh3
- 2.Qe2#
- 2.Qd3#
- 1...Qb7+!
- 1...dxe4
- 1.Qe3?
- 1...dxe4
- 2.Qxe4#
- 1...Qe1
- 2.Qxb3#
- 1...Qd2
- 2.Qxb3#
- 1...Qc3
- 2.Qxc3#
- 1...Qa5
- 2.Qxb3#
- 1...Qa4
- 2.Qc3#
- 1...Qb5
- 2.Qc3#
- 1...Qb6
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...Be2
- 2.Qxe2#
- 1...Bg2
- 2.Qe2#
- 2.Qd3#
- 1...Bd3
- 2.Qxd3#
- 1...Bh3
- 2.Qe2#
- 2.Qd3#
- 1...d4!
- 1...dxe4
- 1.exd5?
- threat
- 2.Qe4#
- 1...Bd3+
- 2.Qxd3#
- 1...Qe1
- 2.Qxb3#
- 1...Qd2
- 2.Qxb3#
- 1...Bg2
- 2.Qd3#
- 1...Qc3!
- threat
- 1.Sd1?
- Keys
- 1.Sg4!
- threat
- 2.Qxf1#
- 1...dxe4
- 2.Qxe4#
- 1...Qe1
- 2.Qxb3#
- 1...Qd2
- 2.Qxb3#
- 1...Qc3
- 2.Qxc3#
- 1...Qa5
- 2.Qxb3#
- 1...Qa4
- 2.Qc3#
- 1...Qb5
- 2.Qc3#
- 1...Qb6
- 2.Qc3#
- 1...Qb7
- 2.Qc3#
- 1...Qb8
- 2.Qc3#
- 1...d4
- 2.Se5#
- 1...Be2
- 2.Qxe2#
- 1...Bg2
- 2.Qe2#
- 1...Bd3
- 2.Se3#
- 1...Bh3
- 2.Qe2#
- threat
- 1.Sg4!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 4
- REMOVED MATES = 0
- Sets
- Q(d);N_GUARD::QAB1(C),XS(c)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- Q(d);N_GUARD::QAR1(C)
- Q(d);N_GUARD,P_PINB(F)::QAR1(C)
- B(a);N_GUARD::QAB(C),XB(a)
- B(a);N_GUARD,P_PINP(D)::QAB1(C),XB(a)
- Tries
- Try
- S(B);
- Threat
- QAB(C),XB(a)
- Vars
- P(g);OGATE,XP(D)::QAR2(C),XP(g)
- Q(d);N_GUARD::QAB1(C),XS(c)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- Q(d);N_GUARD::QAR1(C)
- Q(d);N_GUARD,P_PINB(F)::QAR1(C)
- B(a);N_GUARD::QAB(C),XB(a)
- B(a);N_GUARD::QAB(C)
- B(a);P_PINP(D),SBLOCK::S(B)
- Refutation
- P(g);
- Try
- B(F);
- Vars
- Q(d);N_GUARD::QAB1(C),XS(c)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- Q(d);N_GUARD::QAR1(C)
- P(g);OGATEB::QAB(C)
- B(a);N_GUARD::QAB(C),XB(a)
- B(a);N_GUARD,P_PINP(D)::QAB1(C),XB(a)
- Refutation
- Q(d);CHECK
- Try
- Q(C);
- Vars
- P(g);OGATE,XP(D)::QAR2(C),XP(g)
- Q(d);N_GUARD::QAB1(C),XS(c)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- Q(d);N_GUARD::QAR1(C)
- Q(d);N_GUARD,P_PINB(F)::QAR1(C)
- B(a);N_GUARD::QAB(C),XB(a)
- B(a);N_GUARD,P_PINP(D)::QAB1(C),XB(a)
- Refutation
- P(g);
- Try
- P(D);XP(g)
- Threat
- QAR2(C)
- Vars
- B(a);CHECK,N_GUARD::QAB1(C),XB(a)
- Q(d);N_GUARD::QAB1(C),XS(c)
- B(a);N_GUARD::QAB1(C)
- Refutation
- Q(d);
- Try
- Actual
- S(B);
- Threat
- QAB(C),XB(a)
- Vars
- P(g);OGATE,XP(D)::QAR2(C),XP(g)
- Q(d);N_GUARD::QAB1(C),XS(c)
- Q(d);N_GUARD::QAR1(C),XQ(d)
- Q(d);N_GUARD::QAR1(C)
- Q(d);N_GUARD,P_PINB(F)::QAR1(C)
- P(g);SBLOCK::S(B)
- B(a);N_GUARD::QAB(C),XB(a)
- B(a);N_GUARD::QAB(C)
- B(a);P_PINP(D),SBLOCK::S(B)
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