MESON Chess Problem Database
Problem Display
PID: 285071 (R7/p1N1k3/3NP1Kp/r1n2P2/q4p2/Bp3Q2/8/1b1R4 w - - 0 1)
Ekstrom, Sven Johan Adrian
The Problemist, 1941
#2
9 + 9
| 3713 | Snap | 2026 |
| 6490 | yacpdb | 2026 |
SOLUTION
- SOUND
- Sets
- 1...Qe8+
- 2.Rxe8#
- 1...Qxa3
- 2.Re8#
- 1...Qb4
- 2.Re8#
- 1...Qc4
- 2.Re8#
- 1...Qe4
- 2.Re8#
- 1...Rb5
- 2.Re8#
- 1...Ba2
- 2.f6#
- 1...Bxf5+
- 2.Sxf5#
- 1...Sd3
- 2.f6#
- 1...Se4
- 2.Sc8#
- 1...Sa6
- 2.Sc8#
- 1...Sxe6
- 2.Sc8#
- 1...Sb7
- 2.Sc8#
- 1...Sd7
- 2.Re8#
- 1...Qe8+
- Tries
- 1.Se4?
- threat
- 2.Sd5#
- 2.f6#
- 1...Qe8+
- 2.Rxe8#
- 1...Qxe4
- 2.Rd7#
- 2.Re8#
- 1...Qc6
- 2.f6#
- 1...Qd7
- 2.Rxd7#
- 2.f6#
- 1...Qc4
- 2.Rd7#
- 2.Re8#
- 2.f6#
- 1...Qd4
- 2.Re8#
- 1...Bxe4!
- threat
- 1.Bxc5?
- threat
- 2.Sdb5#
- 2.Sc8#
- 2.Sd5#
- 1...Qe8+
- 2.Rxe8#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qc6
- 2.Sc8#
- 1...Qb5
- 2.Sdxb5#
- 2.Sc8#
- 2.Sd5#
- 1...Qd7
- 2.Sd5#
- 1...Qa3
- 2.Sc8#
- 2.Sd5#
- 2.Re8#
- 1...Qb4
- 2.Sc8#
- 2.Sd5#
- 2.Re8#
- 1...Qc4
- 2.Sc8#
- 2.Re8#
- 1...Qd4
- 2.Re8#
- 1...Qe4
- 2.Sdb5#
- 2.Sc8#
- 2.Re8#
- 1...Rb5
- 2.Sdxb5#
- 2.Sc8#
- 2.Sd5#
- 2.Re8#
- 1...Ra6
- 2.Sc8#
- 2.Sd5#
- 1...Bd3
- 2.Sdb5#
- 2.Sd5#
- 1...Be4
- 2.Sdb5#
- 2.Sc8#
- 1...Rxc5!
- threat
- 1.Rg8?
- threat
- 2.Sc8#
- 1...Qe8+
- 2.Rxe8#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qd7!
- threat
- 1.Rh8?
- threat
- 2.Sc8#
- 1...Qe8+
- 2.Rxe8#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qd7!
- threat
- 1.Qc6?
- threat
- 2.Sd5#
- 2.Re8#
- 1...Bxf5+
- 2.Sxf5#
- 1...Sxe6
- 2.Sc8#
- 2.Re8#
- 1...Qc4
- 2.Re8#
- 2.Qe8#
- 1...Qd4
- 2.Re8#
- 1...Qe4
- 2.Re8#
- 2.Qe8#
- 1...Be4
- 2.Re8#
- 1...Sd3
- 2.Re8#
- 2.f6#
- 1...Se4
- 2.Sc8#
- 2.Re8#
- 1...Sa6
- 2.Sc8#
- 2.Re8#
- 1...Sb7
- 2.Sc8#
- 2.Re8#
- 1...Sd7
- 2.Re8#
- 1...Qxc6!
- threat
- 1.Se4?
- Keys
- 1.Qxf4!
- threat
- 2.Sd5#
- 1...Qe8+
- 2.Rxe8#
- 1...Bxf5+
- 2.Sxf5#
- 1...Qxf4
- 2.Re8#
- 1...Sxe6
- 2.Sc8#
- 1...Qc6
- 2.Qh4#
- 1...Qc4
- 2.Re8#
- 1...Qd4
- 2.Re8#
- 1...Qe4
- 2.Re8#
- 1...Be4
- 2.Qh4#
- 1...Sd3
- 2.f6#
- 1...Se4
- 2.Sc8#
- 1...Sa6
- 2.Sc8#
- 1...Sb7
- 2.Sc8#
- 1...Sd7
- 2.Re8#
- threat
- 1.Qxf4!
Anticipated by 275833(1940)
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 4
- REMOVED MATES = 4
- Sets
- Q(c);CHECK,N_GUARD::R1(I),XQ(c)
- Q(c);N_GUARD,XB(B)::R1(I)
- Q(c);N_GUARD::R1(I)
- R(e);S_CUTQ(c)::R1(I)
- B(a);N_PINP(D)::P(D)
- B(a);CHECK,XP(D)::S(E),XB(a)
- S(f);N_PINP(D)::P(D)
- S(f);N_PINP(D)::B(B)+S(E),DCHECK
- S(f);::B(B)+S(E),DCHECK
- S(f);XP(F)::B(B)+S(E),DCHECK
- S(f);S_CUTQ(c)::R1(I)
- Tries
- Try
- S(E);N_SPINP(D),P_PINS(f)
- Threat
- DUALS(2)
- Vars
- Q(c);CHECK,N_GUARD::R1(I),XQ(c)
- Q(c);P_PINP(F)::P(D)
- Q(c);N_GUARD::R1(I)
- Refutation
- B(a);P_PINP(D),XS(E)
- Try
- B(B);XS(f)
- Threat
- DUALS(3)
- Vars
- Q(c);CHECK,N_GUARD::R1(I),XQ(c)
- B(a);CHECK,XP(D)::B(B)+S(E),DCHECK,XB(a)
- Q(c);::B(B)+S(E),DCHECK
- Q(c);::S(H)
- Q(c);N_GUARD::R1(I)
- Refutation
- R(e);XB(B)
- Try
- R(I);
- Threat
- S(E)
- Vars
- Q(c);CHECK,N_GUARD::R1(I),XQ(c)
- B(a);CHECK,XP(D)::S(E),XB(a)
- Refutation
- Q(c);
- Try
- R(I);
- Threat
- S(E)
- Vars
- Q(c);CHECK,N_GUARD::R1(I),XQ(c)
- B(a);CHECK,XP(D)::S(E),XB(a)
- Refutation
- Q(c);
- Try
- Q(C);
- Threat
- DUALS(2)
- Vars
- B(a);CHECK,XP(D)::S(E),XB(a)
- Q(c);::R1(I)
- B(a);::R1(I)
- S(f);::R1(I)
- Refutation
- Q(c);XQ(C)
- Try
- Actual
- Q(C);XP(d)
- Threat
- S(H)
- Vars
- Q(c);CHECK,N_GUARD::R1(I),XQ(c)
- B(a);CHECK,XP(D)::S(E),XB(a)
- Q(c);N_GUARD,XQ(C)::R1(I)
- S(f);XP(F)::B(B)+S(E),DCHECK
- Q(c);N_GUARD::QAB(C)
- Q(c);N_GUARD::R1(I)
- B(a);S_CUTQ(c)::QAB(C)
- S(f);N_PINP(D)::P(D)
- S(f);N_PINP(D)::B(B)+S(E),DCHECK
- S(f);::B(B)+S(E),DCHECK
- S(f);S_CUTQ(c)::R1(I)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
CSS/Javascript (jQuery, Bootstrap & DataTables).