MESON Chess Problem Database
Problem Display
PID: 239891 (8/b3B1P1/2N2np1/N2k4/pP1p3n/1r2Q2K/B1PRR1PP/1rq5 w - - 0 1)
Ellerman, Arnoldo
Parallele 50, 1947
#2
13 + 10
| 15148 | Sadier Collection | 2021 |
SOLUTION
- SOUND
- Sets
- 1...Qb2
- 2.c4#
- 1...Qa3
- 2.c4#
- 1...Qd1
- 2.c4#
- 1...Qe1
- 2.c4#
- 1...Qf1
- 2.c4#
- 1...Qg1
- 2.c4#
- 1...Qh1
- 2.c4#
- 1...Bb8
- 2.Rxd4#
- 1...Sf3
- 2.Qe6#
- 1...Se4
- 2.g8Q#
- 2.g8B#
- 1...Sg4
- 2.g8Q#
- 2.g8B#
- 1...Sh5
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.g8Q#
- 2.g8B#
- 1...Sh7
- 2.g8Q#
- 2.g8B#
- 1...Se8
- 2.g8Q#
- 2.g8B#
- 1...d3
- 2.Qe5#
- 2.Qe6#
- 1...Qb2
- Tries
- 1.Kxh4?
- threat
- 2.Qg5#
- 2.Qe5#
- 2.Qe6#
- 1...g5+
- 2.Qxg5#
- 1...Qxd2
- 2.Qe5#
- 2.Qe6#
- 1...Qxc2
- 2.Qe5#
- 2.Qe6#
- 1...Se4
- 2.Qxe4#
- 2.g8Q#
- 2.g8B#
- 1...Qf1
- 2.Qe5#
- 2.Qe6#
- 2.c4#
- 1...Bb8
- 2.Rxd4#
- 2.Qxd4#
- 2.Qe6#
- 1...Sg4
- 2.Qf3#
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.Qf3#
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Sh7
- 2.Qf3#
- 2.Qe4#
- 2.Qe5#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Qe1+!
- threat
- 1.Bxb3+?
- 1...axb3
- 2.Qe5#
- 2.Qe6#
- 1...Rxb3!
- 1...axb3
- 1.Rd3?
- threat
- 2.Qe5#
- 2.Qe6#
- 1...Se4
- 2.Qxe4#
- 2.g8Q#
- 2.g8B#
- 1...Bb8
- 2.Rxd4#
- 2.Qxd4#
- 2.Qe6#
- 1...Sf3
- 2.Qe6#
- 1...Sg4
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Qxe3+!
- threat
- 1.Qxb3+?
- 1...axb3
- 2.Re5#
- 1...Rxb3+!
- 1...axb3
- 1.Qc3?
- threat
- 2.Re5#
- 1...Se4
- 2.g8Q#
- 2.g8B#
- 1...Bb8
- 2.Rxd4#
- 1...Sf3
- 2.Qc4#
- 1...Sg4
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.g8Q#
- 2.g8B#
- 1...Qe1!
- threat
- 1.Qd3?
- threat
- 2.Re5#
- 1...Se4
- 2.g8Q#
- 2.g8B#
- 1...Qe1
- 2.c4#
- 1...Sf3
- 2.Qc4#
- 1...Sg4
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.g8Q#
- 2.g8B#
- 1...Bb8!
- threat
- 1.Qf3+?
- 1...Se4
- 2.g8Q#
- 2.g8B#
- 1...Sxf3!
- 1...Se4
- 1.c3?
- threat
- 2.Qe5#
- 2.Qe6#
- 1...Se4
- 2.Qxe4#
- 2.g8Q#
- 2.g8B#
- 1...Bb8
- 2.Rxd4#
- 2.Qxd4#
- 2.Qe6#
- 1...Sf3
- 2.Qe6#
- 1...Sg4
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Qxc3!
- threat
- 1.g3?
- threat
- 2.Qe5#
- 2.Qe6#
- 1...Se4
- 2.Qxe4#
- 2.g8Q#
- 2.g8B#
- 1...Bb8
- 2.Rxd4#
- 2.Qxd4#
- 2.Qe6#
- 1...Sf3
- 2.Qe6#
- 1...Sg4
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.Qe4#
- 2.Qe6#
- 2.g8Q#
- 2.g8B#
- 1...Qf1+!
- threat
- 1.Kxh4?
- Keys
- 1.Qg3!
- threat
- 2.Re5#
- 1...Se4
- 2.g8Q#
- 2.g8B#
- 1...Qe1
- 2.c4#
- 1...Bb8
- 2.Rxd4#
- 1...Sf3
- 2.Qd6#
- 1...Sg4
- 2.g8Q#
- 2.g8B#
- 1...Sd7
- 2.g8Q#
- 2.g8B#
- threat
- 1.Qg3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 0
- REMOVED MATES = 6
- Sets
- Q(b);N_GUARD::P(B)
- Q(b);N_GUARD,P_PINP(E)::P(B)
- Q(b);N_GUARD,P_PINP(F)::P(B)
- B(j);N_GUARD::R1(C),XP(e)
- S(f);N_PINQ(G)::QAB1(G)
- S(h);N_GUARD::P=Q
- Tries
- Try
- K(H);N_SPINQ(G),P-FLIGHT,XS(f)
- Threat
- DUALS(3)
- Vars
- P(i);CHECK::QAR(G),XP(i)
- Refutation
- Q(b);CHECK
- Try
- B(A);CHECK,N_SPINQ(G),XR(c)
- Refutation
- R(a);P_PINQ(G),XB(A)
- Try
- R(C);N_SPINQ(G)
- Threat
- DUALS(2)
- Vars
- S(f);::QAB1(G)
- Refutation
- Q(b);CHECK,XQ(G)
- Try
- Q(G);CHECK,N_SPINQ(G),XR(c)
- Vars
- P(d);N_SPINP(e),P_SPINP(d),XQ(G)::R1(D)
- Refutation
- R(a);CHECK,P_SPINR(a),XQ(G)
- Try
- Q(G);
- Threat
- R1(D)
- Vars
- S(h);N_GUARD::P=Q
- B(j);N_GUARD::R1(C),XP(e)
- S(f);N_PINQ(G)::QAB1(G)
- Refutation
- Q(b);
- Try
- Q(G);
- Threat
- R1(D)
- Vars
- S(h);N_GUARD::P=Q
- Q(b);N_GUARD::P(B)
- S(f);N_PINQ(G)::QAB1(G)
- Refutation
- B(j);
- Try
- Q(G);CHECK
- Vars
- S(h);P_SPINS(h)::P=Q
- Refutation
- S(f);XQ(G)
- Try
- P(B);N_SPINQ(G)
- Threat
- DUALS(2)
- Vars
- S(f);::QAB1(G)
- Refutation
- Q(b);P_PINQ(G),XP(B)
- Try
- P(E);N_SPINQ(G)
- Threat
- DUALS(2)
- Vars
- S(f);::QAB1(G)
- Refutation
- Q(b);CHECK
- Try
- Actual
- Q(G);
- Threat
- R1(D)
- Vars
- S(h);N_GUARD::P=Q
- Q(b);N_GUARD::P(B)
- B(j);N_GUARD::R1(C),XP(e)
- S(f);N_PINQ(G)::QAR1(G)
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).