MESON Chess Problem Database
Problem Display
PID: 194799 (8/3K4/p7/PnQB2n1/5b2/3k2Np/3p3P/1N1R4 w - - 0 1)
Stewart, John
The Observer, 1941
(First published on Sun Aug 10 1941)
#2
8 + 7
| 15239 | Valois Notebooks | 2019 |
SOLUTION
- SOUND
- Sets
- 1...Be3
- 2.Qc4#
- 1...Bxg3
- 2.Rxd2#
- 1...Be5
- 2.Rxd2#
- 1...Bd6
- 2.Rxd2#
- 1...Bc7
- 2.Rxd2#
- 1...Bb8
- 2.Rxd2#
- 1...Sa3
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sa7
- 2.Qc3#
- 1...Sc7
- 2.Qc3#
- 1...Sf3
- 2.Be4#
- 1...Se4
- 2.Bxe4#
- 1...Se6
- 2.Be4#
- 1...Sf7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Be3
- Tries
- 1.Ke7?
- 1...Bxg3
- 2.Rxd2#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Be3
- 2.Qc4#
- 1...Be5
- 2.Rxd2#
- 1...Bc7
- 2.Rxd2#
- 1...Bb8
- 2.Rxd2#
- 1...Sa3
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sa7
- 2.Qc3#
- 1...Sc7
- 2.Qc3#
- 1...Sf3
- 2.Be4#
- 1...Se4
- 2.Bxe4#
- 1...Se6
- 2.Be4#
- 1...Sf7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Bd6+!
- 1...Bxg3
- 1.Bg2?
- threat
- 2.Bf1#
- 1...Bxg3
- 2.Rxd2#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...hxg2!
- threat
- 1.Bb3?
- threat
- 2.Bc2#
- 1...Sd4
- 2.Qc3#
- 1...Sa3
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Bxg3!
- threat
- 1.Bf3?
- threat
- 2.Be2#
- 1...Bxg3
- 2.Rxd2#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Sxf3!
- threat
- 1.Bc6?
- 1...Bxg3
- 2.Rxd2#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Sf3
- 2.Be4#
- 1...Be5
- 2.Rxd2#
- 1...Bd6
- 2.Rxd2#
- 1...Bc7
- 2.Rxd2#
- 1...Bb8
- 2.Rxd2#
- 1...Sa3
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sa7
- 2.Qc3#
- 1...Sc7
- 2.Qc3#
- 1...Se4
- 2.Bxe4#
- 1...Se6
- 2.Be4#
- 1...Sf7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Be3!
- 1...Bxg3
- 1.Bb7?
- 1...Bxg3
- 2.Rxd2#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Be5
- 2.Rxd2#
- 1...Bd6
- 2.Rxd2#
- 1...Bc7
- 2.Rxd2#
- 1...Bb8
- 2.Rxd2#
- 1...Sa3
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sa7
- 2.Qc3#
- 1...Sc7
- 2.Qc3#
- 1...Sf3
- 2.Be4#
- 1...Se4
- 2.Bxe4#
- 1...Se6
- 2.Be4#
- 1...Sf7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Be3!
- 1...Bxg3
- 1.Ba8?
- 1...Bxg3
- 2.Rxd2#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Be5
- 2.Rxd2#
- 1...Bd6
- 2.Rxd2#
- 1...Bc7
- 2.Rxd2#
- 1...Bb8
- 2.Rxd2#
- 1...Sa3
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sa7
- 2.Qc3#
- 1...Sc7
- 2.Qc3#
- 1...Sf3
- 2.Be4#
- 1...Se4
- 2.Bxe4#
- 1...Se6
- 2.Be4#
- 1...Sf7
- 2.Be4#
- 1...Sh7
- 2.Be4#
- 1...Be3!
- 1...Bxg3
- 1.Ke7?
- Keys
- 1.Qb4!
- 1...Kc2
- 2.Qb3#
- 1...Ke3
- 2.Qxd2#
- 1...Bxg3
- 2.Qxd2#
- 1...Be3
- 2.Qc4#
- 1...Be5
- 2.Qxd2#
- 1...Bd6
- 2.Qxd2#
- 1...Bc7
- 2.Qxd2#
- 1...Bb8
- 2.Qxd2#
- 1...Sa3
- 2.Qc3#
- 1...Sc3
- 2.Qxc3#
- 1...Sd4
- 2.Qc3#
- 1...Sd6
- 2.Qc3#
- 1...Sa7
- 2.Qc3#
- 1...Sc7
- 2.Qc3#
- 1...Sf3
- 2.Qe4#
- 1...Se4
- 2.Qxe4#
- 1...Se6
- 2.Qe4#
- 1...Sf7
- 2.Qe4#
- 1...Sh7
- 2.Qe4#
- 1...Kc2
- 1.Qb4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 10
- ADDED MATES = 2
- REMOVED MATES = 0
- Sets
- B(d);SBLOCK::QAB1(F)
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- B(d);N_GUARD::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(f);N_GUARD::B(G)
- S(f);N_GUARD::B(G),XS(f)
- Tries
- Try
- K(H);P-FLIGHT
- Vars
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(e);N_GUARD::QAR1(F)
- B(d);SBLOCK::QAB1(F)
- B(d);N_GUARD::R1(B),XP(a)
- S(f);N_GUARD::B(G)
- S(f);N_GUARD::B(G),XS(f)
- Refutation
- B(d);CHECK
- Try
- B(G);
- Threat
- B(G)
- Vars
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(e);N_GUARD::QAR1(F)
- Refutation
- P(c);XB(G)
- Try
- B(G);
- Threat
- B(G)
- Vars
- S(e);N_GUARD::QAR1(F)
- S(e);N_GUARD::QAR1(F),XS(e)
- Refutation
- B(d);XS(D)
- Try
- B(G);
- Threat
- B(G)
- Vars
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(e);N_GUARD::QAR1(F)
- Refutation
- S(f);XB(G)
- Try
- B(G);
- Vars
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(e);N_GUARD::QAR1(F)
- S(f);N_GUARD::B(G)
- B(d);N_GUARD::R1(B),XP(a)
- S(f);N_GUARD::B(G),XS(f)
- Refutation
- B(d);
- Try
- B(G);
- Vars
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(e);N_GUARD::QAR1(F)
- B(d);N_GUARD::R1(B),XP(a)
- S(f);N_GUARD::B(G)
- S(f);N_GUARD::B(G),XS(f)
- Refutation
- B(d);
- Try
- B(G);
- Vars
- B(d);N_GUARD,XS(D)::R1(B),XP(a)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(e);N_GUARD::QAR1(F)
- B(d);N_GUARD::R1(B),XP(a)
- S(f);N_GUARD::B(G)
- S(f);N_GUARD::B(G),XS(f)
- Refutation
- B(d);
- Try
- Actual
- Q(F);
- Vars
- K(b);N_SPINP(a),S_FLIGHT::QAB1(F)
- K(b);N_SPINP(a),P-FLIGHT::QAB1(F),XP(a)
- B(d);N_GUARD,XS(D)::QAR1(F),XP(a)
- B(d);SBLOCK::QAB1(F)
- B(d);N_GUARD::QAR1(F),XP(a)
- S(e);N_GUARD::QAR1(F)
- S(e);N_GUARD::QAR1(F),XS(e)
- S(f);N_GUARD::QAB1(F)
- S(f);N_GUARD::QAB1(F),XS(f)
Developed and maintained by Brian Stephenson.
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