MESON Chess Problem Database
Problem Display
PID: 300 (5R2/6K1/2n1QN1P/3P4/1R1qbk1P/b1np4/7P/4N1B1 w - - 0 1)
Ellerman, Arnoldo
4th Prize, The Observer, 1920
(First published on Sun Jul 11 1920)
#2
11 + 7
| 887 | Mate in Two Moves | 1931 |
| 3174 | The Two-move Chess Problem Tradition and Development | 1966 |
| 133 | The Problemist Supplement | 2007 |
| 15239 | Valois Notebooks | 2020 |
SOLUTION
- SOUND
- Sets
- 1...Qxg1+
- 2.Sg4#
- 1...Qf2
- 2.Sg4#
- 1...Qe3
- 2.Sxe4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Qc5
- 2.Sh5#
- 1...Qe5
- 2.Qg4#
- 1...Qb6
- 2.Sxe4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Qxf6+
- 2.Rxf6#
- 1...Qa7+
- 2.Sd7#
- 1...Qxb4
- 2.Sh5#
- 1...Qc4
- 2.Sxe4#
- 2.Sh5#
- 1...Qxd5
- 2.Sxd5#
- 2.Sh5#
- 1...Bh1
- 2.Be3#
- 1...Bg2
- 2.Be3#
- 1...Bf3
- 2.Sxd3#
- 2.Be3#
- 1...Bxd5
- 2.Be3#
- 1...Bf5
- 2.Be3#
- 2.Qe3#
- 1...Bg6
- 2.Be3#
- 1...Bh7
- 2.Be3#
- 1...Se5
- 2.Sh5#
- 1...Qxg1+
- Tries
- 1.Kg8?
- threat
- 2.Sh5#
- 1...Qxg1+
- 2.Sg4#
- 1...Bh7+
- 2.Sxh7#
- 1...Qxf6
- 2.Rxf6#
- 1...Qf2
- 2.Sg4#
- 1...Bf5
- 2.Be3#
- 2.Qe3#
- 1...Se7+!
- threat
- 1.Sg2+?
- 1...Kf3
- 2.Qg4#
- 1...Bxg2!
- 1...Kf3
- 1.Sxd3+?
- 1...Kf3
- 2.Qg4#
- 1...Qxd3
- 2.Sxe4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Bxd3!
- 1...Kf3
- 1.Be3+?
- 1...Qxe3
- 2.Sxe4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 1...Kxe3!
- 1...Qxe3
- 1.Bxd4?
- threat
- 2.Sxe4#
- 2.Sh5#
- 2.Qg4#
- 1...Bxb4
- 2.Sh5#
- 2.Qg4#
- 1...Bxd5
- 2.Se4#
- 2.Sg4#
- 2.Sxd5#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Be3#
- 2.Qg4#
- 1...Sxd5
- 2.Sxd5#
- 2.Sh5#
- 2.Qg4#
- 2.Qxe4#
- 1...Bh1
- 2.Se4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Be3#
- 2.Qg4#
- 1...Bg2
- 2.Se4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Be3#
- 2.Qg4#
- 1...Bf3
- 2.Sxd3#
- 2.Se4#
- 2.Sg4#
- 2.Sh5#
- 2.Sd7#
- 2.Sh7#
- 2.Se8#
- 2.Sg8#
- 2.Be3#
- 1...Bf5
- 2.Be3#
- 2.Qe3#
- 1...Bg6
- 2.Sh5#
- 2.Be3#
- 2.Qg4#
- 1...Bh7
- 2.Sh5#
- 2.Sxh7#
- 2.Be3#
- 2.Qg4#
- 1...Se5
- 2.Sh5#
- 2.Qxe5#
- 1...Se7
- 2.Sh5#
- 2.Qg4#
- 2.Qe5#
- 1...Sd8
- 2.Sh5#
- 2.Qg4#
- 2.Qe5#
- 1...Sxd4!
- threat
- 1.Kg8?
- Keys
- 1.Sf3!
- threat
- 2.Qg4#
- 1...Qxg1+
- 2.Sg4#
- 1...Qxf6+
- 2.Rxf6#
- 1...Qa7+
- 2.Sd7#
- 1...Kxf3
- 2.Qg4#
- 1...Bxf3
- 2.Be3#
- 1...Qf2
- 2.Sg4#
- 1...Bf5
- 2.Qe3#
- 1...Se5
- 2.Sh5#
- threat
- 1.Sf3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 3
- REMOVED MATES = 8
- Sets
- Q(d);CHECK,N_PINS(H),P_SPINB(e),XB(B)::R(K)+S(H)
- Q(d);N_PINS(H),P_SPINB(e)::R(K)+S(H)
- Q(d);N_PINS(H),P_SPINB(e)::R(K)+S(H),DCHECK
- Q(d);P_SPINB(e),SBLOCK::QAR1(G)
- Q(d);CHECK,OGATE,P_SPINB(e),P_SPINQ(d),XS(H)::R(K),XQ(d)
- Q(d);CHECK,N_PINS(H),P_SPINB(e)::R(K)+S(H)
- Q(d);N_PINS(H),XR(D)::R(K)+S(H),DCHECK
- B(e);P_SPINQ(d)::B(B)
- B(e);P_SPINQ(d),XP(F)::B(B)
- S(g);N_PINS(H)::R(K)+S(H),DCHECK
- Tries
- Try
- K(J);N_SPINS(H),P-FLIGHT
- Threat
- R(K)+S(H),DCHECK
- Vars
- Q(d);CHECK,N_GUARD,P_SPINB(e),XB(B)::R(K)+S(H)
- B(e);CHECK,N_GUARD,P_SPINQ(d)::R(K)+S(H),XB(e)
- Q(d);OGATE,P_SPINB(e),P_SPINQ(d),XS(H)::R(K),XQ(d)
- Q(d);N_GUARD,P_SPINB(e)::R(K)+S(H)
- Refutation
- S(g);CHECK
- Try
- S(A);CHECK
- Vars
- K(f);P-FLIGHT::QAB1(G)
- Refutation
- B(e);P_SPINQ(d),XS(A)
- Try
- S(A);CHECK,XP(c)
- Vars
- K(f);P-FLIGHT::QAB1(G)
- Refutation
- B(e);P_SPINQ(d),XS(A)
- Try
- B(B);CHECK
- Refutation
- K(f);P_SPINB(e),S_FLIGHT,XB(B)
- Try
- B(B);N_SPINS(H),XQ(d)
- Threat
- DUALS(3)
- Refutation
- S(g);XB(B)
- Try
- Actual
- S(A);
- Threat
- QAR1(G)
- Vars
- Q(d);CHECK,N_PINS(H),P_SPINB(e),XB(B)::R(K)+S(H)
- Q(d);CHECK,OGATE,P_SPINB(e),P_SPINQ(d),XS(H)::R(K),XQ(d)
- Q(d);CHECK,N_PINS(H),P_SPINB(e)::R(K)+S(H)
- K(f);P-FLIGHT,XS(A)::QAB1(G)
- B(e);P_SPINQ(d),SBLOCK,XS(A)::B(B)
- Q(d);N_PINS(H),P_SPINB(e)::R(K)+S(H)
- B(e);OGATE,P_SPINQ(d),SBLOCK::QAB1(G)
- S(g);N_PINS(H)::R(K)+S(H),DCHECK
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