MESON Chess Problem Database
Problem Display
PID: 138502 (1B6/1pP3pK/1rk4p/PN6/PP2R3/1n1qp2B/1n6/6RQ w - - 0 1)
Ellerman, Arnoldo
L'Italia Scacchistica, 1926
#2
11 + 9
SOLUTION
- SOUND
- Sets
- 1...Qf1
- 2.Rc4#
- 1...Qe2
- 2.Rc4#
- 1...Qc4
- 2.Rxc4#
- 1...Qxe4+
- 2.Qxe4#
- 1...Qd1
- 2.Rc4#
- 1...Qd2
- 2.Rc4#
- 1...Qc3
- 2.Rxe3#
- 2.Rc4#
- 2.Rd4#
- 2.Rf4#
- 2.Rh4#
- 2.Re5#
- 2.Re7#
- 2.Re8#
- 1...Qd4
- 2.Rxd4#
- 1...Qd5
- 2.c8Q#
- 2.c8R#
- 1...Qd6
- 2.Rc4#
- 1...Qd7
- 2.Rc4#
- 2.Re6#
- 1...Qd8
- 2.Rc4#
- 1...g6
- 2.Rc4#
- 1...Qf1
- Tries
- 1.Be6?
- threat
- 2.c8Q#
- 2.c8R#
- 1...Qxe4+
- 2.Qxe4#
- 1...Qxb5
- 2.c8Q#
- 2.c8R#
- 1...Rxb5
- 2.c8Q#
- 2.c8R#
- 1...Sxa5
- 2.c8Q#
- 2.c8R#
- 1...Qb1
- 2.c8Q#
- 2.c8R#
- 1...Qf1
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qc2
- 2.c8Q#
- 2.c8R#
- 1...Qe2
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qc4
- 2.Rxc4#
- 2.c8Q#
- 2.c8R#
- 1...Qd1
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qd2
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qc3
- 2.Rxe3#
- 2.Rc4#
- 2.Rd4#
- 2.Rf4#
- 2.Reg4#
- 2.Rh4#
- 2.Re5#
- 2.c8Q#
- 2.c8R#
- 1...Qd4
- 2.Rxd4#
- 2.c8Q#
- 2.c8R#
- 1...Qd5
- 2.c8Q#
- 2.c8R#
- 1...Qd6
- 2.Sa7#
- 2.Rc4#
- 1...Qd7
- 2.Rc4#
- 1...Qd8
- 2.Rc4#
- 2.cxd8S#
- 1...Ra6
- 2.c8Q#
- 2.c8R#
- 1...Sd1
- 2.c8Q#
- 2.c8R#
- 1...Sc4
- 2.c8Q#
- 2.c8R#
- 1...Sa1
- 2.c8Q#
- 2.c8R#
- 1...Sc1
- 2.c8Q#
- 2.c8R#
- 1...Sd2
- 2.c8Q#
- 2.c8R#
- 1...Sd4
- 2.c8Q#
- 2.c8R#
- 1...Sc5
- 2.c8Q#
- 2.c8R#
- 1...e2
- 2.c8Q#
- 2.c8R#
- 1...h5
- 2.c8Q#
- 2.c8R#
- 1...g5
- 2.c8Q#
- 2.c8R#
- 1...g6
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Sxa4!
- threat
- 1.Rg5?
- threat
- 2.c8Q#
- 2.c8R#
- 1...Qxe4+
- 2.Qxe4#
- 1...Qxb5
- 2.c8Q#
- 2.c8R#
- 1...Rxb5
- 2.c8Q#
- 2.c8R#
- 1...Sxa4
- 2.c8Q#
- 2.c8R#
- 1...Sxa5
- 2.Rc5#
- 2.c8Q#
- 2.c8R#
- 1...Qb1
- 2.c8Q#
- 2.c8R#
- 1...Qf1
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qc2
- 2.c8Q#
- 2.c8R#
- 1...Qe2
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qc4
- 2.Rxc4#
- 2.c8Q#
- 2.c8R#
- 1...Qd1
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qd2
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...Qc3
- 2.Rxe3#
- 2.Rc4#
- 2.Rd4#
- 2.Rf4#
- 2.Rh4#
- 2.Ree5#
- 2.Re7#
- 2.Re8#
- 2.c8Q#
- 2.c8R#
- 1...Qd4
- 2.Rxd4#
- 2.c8Q#
- 2.c8R#
- 1...Qd5
- 2.c8Q#
- 2.c8R#
- 1...Qd6
- 2.Sa7#
- 2.Rc4#
- 1...Qd7
- 2.Rc4#
- 2.Re6#
- 1...Qd8
- 2.Rc4#
- 2.cxd8S#
- 1...Ra6
- 2.c8Q#
- 2.c8R#
- 1...Sd1
- 2.c8Q#
- 2.c8R#
- 1...Sc4
- 2.c8Q#
- 2.c8R#
- 1...Sa1
- 2.Rc5#
- 2.c8Q#
- 2.c8R#
- 1...Sc1
- 2.Rc5#
- 2.c8Q#
- 2.c8R#
- 1...Sd2
- 2.Rc5#
- 2.c8Q#
- 2.c8R#
- 1...Sd4
- 2.Rc5#
- 2.c8Q#
- 2.c8R#
- 1...Sc5
- 2.Rxc5#
- 2.c8Q#
- 2.c8R#
- 1...e2
- 2.c8Q#
- 2.c8R#
- 1...h5
- 2.c8Q#
- 2.c8R#
- 1...g6
- 2.Rc4#
- 2.c8Q#
- 2.c8R#
- 1...hxg5!
- threat
- 1.Rg6+?
- 1...Qd6
- 2.Rxe3#
- 2.Rc4#
- 2.Rd4#
- 2.Rf4#
- 2.Rh4#
- 2.Re5#
- 2.Re7#
- 2.Re8#
- 2.Rxd6#
- 1...Kd5!
- 1...Qd6
- 1.c8S?
- threat
- 2.Se7#
- 1...Qxe4+
- 2.Qxe4#
- 1...Kd5
- 2.Se7#
- 1...Qd6
- 2.Rc4#
- 1...Qd7
- 2.Rc4#
- 2.Re6#
- 1...Qd8
- 2.Rc4#
- 1...Sxa4!
- threat
- 1.Be6?
- Keys
- 1.Sc3!
- threat
- 2.c8Q#
- 2.c8R#
- 1...Qxe4+
- 2.Rg6#
- 1...Kd6
- 2.Rg6#
- 2.c8Q#
- 2.c8R#
- 1...Qxc3
- 2.Rd4#
- 1...Rxb4
- 2.c8Q#
- 2.c8R#
- 1...Sxa4
- 2.c8Q#
- 2.c8R#
- 1...Sxa5
- 2.c8Q#
- 2.c8R#
- 1...Qb1
- 2.Rg6#
- 2.c8Q#
- 2.c8R#
- 1...Qf1
- 2.c8Q#
- 2.c8R#
- 1...Qc2
- 2.Rg6#
- 2.c8Q#
- 2.c8R#
- 1...Qe2
- 2.Rg6#
- 2.c8Q#
- 2.c8R#
- 1...Qc4
- 2.c8Q#
- 2.c8R#
- 1...Qb5
- 2.Rg6#
- 2.c8Q#
- 2.c8R#
- 1...Qa6
- 2.Rg6#
- 2.Rd4#
- 2.c8Q#
- 2.c8R#
- 1...Qd1
- 2.c8Q#
- 2.c8R#
- 1...Qd2
- 2.c8Q#
- 2.c8R#
- 1...Qd4
- 2.Rxd4#
- 2.c8Q#
- 2.c8R#
- 1...Qd5
- 2.c8Q#
- 2.c8R#
- 1...Qd6
- 2.Rc4#
- 1...Qd7
- 2.Re6#
- 1...Qd8
- 2.cxd8S#
- 1...Rb5
- 2.c8Q#
- 2.c8R#
- 1...Ra6
- 2.c8Q#
- 2.c8R#
- 1...Sd1
- 2.c8Q#
- 2.c8R#
- 1...Sc4
- 2.c8Q#
- 2.c8R#
- 1...Sa1
- 2.c8Q#
- 2.c8R#
- 1...Sc1
- 2.c8Q#
- 2.c8R#
- 1...Sd2
- 2.c8Q#
- 2.c8R#
- 1...Sd4
- 2.c8Q#
- 2.c8R#
- 1...Sc5
- 2.c8Q#
- 2.c8R#
- 1...e2
- 2.c8Q#
- 2.c8R#
- 1...h5
- 2.c8Q#
- 2.c8R#
- 1...g5
- 2.c8Q#
- 2.c8R#
- 1...g6
- 2.c8Q#
- 2.c8R#
- threat
- 1.Sc3!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 2
- ADDED MATES = 2
- REMOVED MATES = 7
- Sets
- Q(c);N_PINR(F)::QAB(B)+R(F),DCHECK
- Q(c);N_PINR(F)::QAB(B)+R(F),DCHECK,XQ(c)
- Q(c);CHECK,OGATE,P_SPINQ(c),XR(F)::QAB(B),XQ(c)
- Q(c);N_PINR(F)::QAB(B)+R(F),XQ(c)
- Q(c);N_PINR(F),SBLOCK::P=Q
- P(i);N_PINR(F)::QAB(B)+R(F),DCHECK
- Tries
- Try
- B(C);
- Threat
- P=Q
- Vars
- Q(c);CHECK,OGATE,P_SPINQ(c),XR(F)::QAB(B),XQ(c)
- Q(c);N_PINR(F),XS(H)::P=Q
- R(e);XS(H)::P=Q
- S(b);XP(G)::P=Q
- Q(c);::P=Q
- Q(c);N_PINR(F)::P=Q
- Q(c);N_PINR(F)::QAB(B)+R(F),DCHECK
- R(e);::P=Q
- S(a);::P=Q
- S(b);::P=Q
- P(d);::P=Q
- P(g);::P=Q
- P(i);::P=Q
- Refutation
- S(a);XP(D)
- Try
- R(A);
- Threat
- P=Q
- Vars
- Q(c);CHECK,OGATE,P_SPINQ(c),XR(F)::QAB(B),XQ(c)
- Q(c);N_PINR(F),XS(H)::P=Q
- R(e);XS(H)::P=Q
- S(a);XP(D)::P=Q
- Q(c);::P=Q
- Q(c);N_PINR(F)::P=Q
- R(e);::P=Q
- S(a);::P=Q
- P(d);::P=Q
- P(g);::P=Q
- Refutation
- P(g);XR(A)
- Try
- R(A);CHECK,N_SPINR(F)
- Refutation
- K(f);S_FLIGHT
- Try
- P(I);
- Threat
- S(I)
- Vars
- Q(c);CHECK,OGATE,P_SPINQ(c),XR(F)::QAB(B),XQ(c)
- K(f);S_FLIGHT::S(I)
- Q(c);N_PINR(F)::QAB(B)+R(F),DCHECK
- Refutation
- S(a);XP(D)
- Try
- Actual
- S(H);
- Threat
- P=Q
- Vars
- Q(c);CHECK,N_GUARD,P_SPINQ(c),XR(F)::R(A)
- Q(c);N_PINR(F),XS(H)::QAB(B)+R(F)
- R(e);XP(E)::P=Q
- S(a);XP(D)::P=Q
- S(b);XP(G)::P=Q
- Q(c);N_PINR(F)::P=Q
- Q(c);N_PINR(F),SBLOCK::QAB(B)+R(F),DCHECK
- Q(c);N_PINR(F),OGATE::PXQ(c)=S
- R(e);::P=Q
- S(a);::P=Q
- S(b);::P=Q
- P(d);::P=Q
- P(g);::P=Q
- P(i);::P=Q
- P(i);N_PINR(F)::P=Q
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).