MESON Chess Problem Database
Problem Display
PID: 2939 (N3n3/b2N4/kPP5/rb6/4n2K/8/R4Q2/5B2 w - - 0 1)
Paparella, Vittorio
Source?, 1912
#2
8 + 6
| 2681 | All Change Here! | 1919 |
SOLUTION
- SOUND
- Sets
- 1...Rxa2
- 2.Qxa2#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Bxf1
- 2.Qxf1#
- 1...Be2
- 2.Bxe2#
- 2.Qxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bxb6
- 2.Qxb6#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sxf2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa2
- Tries
- 1.Be2?
- 1...Bxe2
- 2.Qxe2#
- 1...Bxb6
- 2.Qxb6#
- 1...Sxf2
- 2.Sc5#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa2!
- 1...Bxe2
- 1.Bd3?
- 1...Rxa2
- 2.Qxa2#
- 1...Bxb6
- 2.Qxb6#
- 1...Sxf2
- 2.Sc5#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Bxd3!
- 1...Rxa2
- 1.Bc4?
- 1...Rxa2
- 2.Qxa2#
- 1...Bxb6
- 2.Qxb6#
- 1...Sxf2
- 2.Sc5#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Bxc4!
- 1...Rxa2
- 1.Ra1?
- 1...Bxf1
- 2.Qxf1#
- 1...Bxb6
- 2.Qxb6#
- 1...Sxf2
- 2.Sc5#
- 1...Ra2
- 2.Rxa2#
- 2.Qxa2#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Be2
- 2.Bxe2#
- 2.Qxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa1!
- 1...Bxf1
- 1.Ra3?
- 1...Bxf1
- 2.Qxf1#
- 1...Bxb6
- 2.Qxb6#
- 1...Sxf2
- 2.Sc5#
- 1...Ra4
- 2.Rxa4#
- 1...Be2
- 2.Bxe2#
- 2.Qxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa3!
- 1...Bxf1
- 1.Ra4?
- 1...Bxf1
- 2.Qxf1#
- 1...Bxb6
- 2.Qxb6#
- 1...Sxf2
- 2.Sc5#
- 1...Be2
- 2.Bxe2#
- 2.Qxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa4!
- 1...Bxf1
- 1.Qg1?
- 1...Bxf1
- 2.Qxf1#
- 1...Bxb6
- 2.Qxb6#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Be2
- 2.Bxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sf2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa2!
- 1...Bxf1
- 1.Qd2?
- threat
- 2.Rxa5#
- 2.Qxa5#
- 1...Rxa2
- 2.Qxa2#
- 1...Sxd2
- 2.Sc5#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Sc3
- 2.Sc5#
- 1...Bxb6!
- threat
- 1.Qe2?
- threat
- 2.Qxb5#
- 1...Bxe2
- 2.Bxe2#
- 1...Bd3
- 2.Qxd3#
- 1...Bc4
- 2.Qxc4#
- 1...Sc3
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Bxb6!
- threat
- 1.Qg2?
- 1...Rxa2
- 2.Qxa2#
- 1...Bxf1
- 2.Qxf1#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Be2
- 2.Bxe2#
- 2.Qxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sf2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Bxb6!
- 1...Rxa2
- 1.Qf5?
- threat
- 2.Bxb5#
- 2.Qxb5#
- 1...Rxa2
- 2.Qxb5#
- 1...Bxf1
- 2.Rxa5#
- 2.Qxf1#
- 2.Qxa5#
- 1...Ra3
- 2.Rxa3#
- 2.Qxb5#
- 1...Ra4
- 2.Rxa4#
- 2.Qxb5#
- 1...Be2
- 2.Bxe2#
- 2.Rxa5#
- 2.Qxa5#
- 1...Bd3
- 2.Bxd3#
- 2.Rxa5#
- 2.Qxa5#
- 1...Bc4
- 2.Bxc4#
- 2.Rxa5#
- 2.Qxa5#
- 1...Sc3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...S4d6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Bxb6!
- threat
- 1.Be2?
- Keys
- 1.Qf7!
- 1...Rxa2
- 2.Qxa2#
- 1...Bxf1
- 2.Qxf1#
- 1...Bxb6
- 2.Sb8#
- 1...Ra3
- 2.Rxa3#
- 1...Ra4
- 2.Rxa4#
- 1...Be2
- 2.Bxe2#
- 1...Bd3
- 2.Bxd3#
- 1...Bc4
- 2.Bxc4#
- 2.Qxc4#
- 1...Bb8
- 2.Sxb8#
- 1...Sd2
- 2.Sc5#
- 1...Sf2
- 2.Sc5#
- 1...Sc3
- 2.Sc5#
- 1...Sg3
- 2.Sc5#
- 1...Sc5
- 2.Sxc5#
- 1...Sg5
- 2.Sc5#
- 1...S4d6
- 2.Sc5#
- 1...S4f6
- 2.Sc5#
- 1...S8d6
- 2.Sc7#
- 1...S8f6
- 2.Sc7#
- 1...Sc7
- 2.Sxc7#
- 1...Sg7
- 2.Sc7#
- 1...Rxa2
- 1.Qf7!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 1
- ADDED MATES = 1
- REMOVED MATES = 1
- Sets
- R(b);N_SPINR(b),OGATE,XR(B)::QAR(C),XR(b)
- R(b);OGATEB::R(B),XR(b)
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(c);OGATEB::B(A),XB(c)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD,XQ(C)::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Tries
- Try
- B(A);
- Vars
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- S(a);N_GUARD,XQ(C)::S(G)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- R(b);N_SPINR(b),XR(B)
- Try
- B(A);
- Vars
- R(b);N_SPINR(b),OGATE,XR(B)::QAR(C),XR(b)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- S(a);N_GUARD,XQ(C)::S(G)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- B(c);N_SPINB(c),XB(A)
- Try
- B(A);
- Vars
- R(b);N_SPINR(b),OGATE,XR(B)::QAR(C),XR(b)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- S(a);N_GUARD,XQ(C)::S(G)
- R(b);OGATEB::R(B),XR(b)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- B(c);N_SPINB(c),XB(A)
- Try
- R(B);
- Vars
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- S(a);N_GUARD,XQ(C)::S(G)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- R(b);N_SPINR(b),XR(B)
- Try
- R(B);
- Vars
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- S(a);N_GUARD,XQ(C)::S(G)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- R(b);N_SPINR(b),XR(B)
- Try
- R(B);
- Vars
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- S(a);N_GUARD,XQ(C)::S(G)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- R(b);N_SPINR(b),XR(B)
- Try
- Q(C);
- Vars
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(e);OGATE,XP(E)::QAR1(C),XB(e)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- R(b);N_SPINR(b),XR(B)
- Try
- Q(C);
- Threat
- DUALS(2)
- Vars
- R(b);N_SPINR(b),OGATE,XR(B)::QAR(C),XR(b)
- S(a);N_GUARD,XQ(C)::S(G)
- R(b);OGATEB::R(B),XR(b)
- S(a);N_GUARD::S(G)
- Refutation
- B(e);XP(E)
- Try
- Q(C);
- Threat
- QAB1(C),XB(c)
- Vars
- B(c);OGATE,XQ(C)::B(A),XB(c)
- B(c);OGATEB::QAB(C),XB(c)
- S(a);N_GUARD::S(G)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- B(e);XP(E)
- Try
- Q(C);
- Vars
- R(b);N_SPINR(b),OGATE,XR(B)::QAR(C),XR(b)
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- B(e);XP(E)
- Try
- Q(C);
- Threat
- DUALS(2)
- Vars
- R(b);N_SPINR(b),XR(B)::QAB1(C),XB(c)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
- Refutation
- B(e);XP(E)
- Try
- Actual
- Q(C);
- Vars
- R(b);N_SPINR(b),OGATE,XR(B)::QAR(C),XR(b)
- B(c);N_SPINB(c),OGATE,XB(A)::QAB(C),XB(c)
- B(e);N_GUARD,XP(E)::S(G)
- R(b);OGATEB::R(B),XR(b)
- B(c);OGATEB::B(A),XB(c)
- B(e);N_GUARD::S(G),XB(e)
- S(a);N_GUARD::S(G)
- S(a);N_GUARD::S(G),XS(a)
- S(f);N_GUARD::S(H)
- S(f);N_GUARD::S(H),XS(f)
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).