MESON Chess Problem Database
Problem Display
PID: 61160 (8/3N4/2pP4/3r2B1/2k1P2K/5N2/bQB5/8 w - - 0 1)
Lewis, Robert Tony
The Problemist, 1987
#2
8 + 4
| 136 | Problem Observer | 2005 |
SOLUTION
- SOUND
- Sets
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd3
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rxg5
- 2.Sd2#
- 1...Rxd6
- 2.Sfe5#
- 1...Bb1
- 2.Qb3#
- 1...Bb3
- 2.Qxb3#
- 1...c5
- 2.Sb6#
- 1...Rd1
- Tries
- 1.Kh3?
- 1...Rxg5
- 2.Sd2#
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rd3!
- 1...Rxg5
- 1.Kg4?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rxg5+!
- 1...Rxd6
- 1.Kh5?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rxg5+!
- 1...Rxd6
- 1.Bd1?
- 1...Kd3
- 2.Qc2#
- 1...Rxd1
- 2.Sfe5#
- 1...Rxg5
- 2.Be2#
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd2
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Be2#
- 1...Rb5
- 2.Be2#
- 2.Qd4#
- 1...Rc5
- 2.Be2#
- 1...Re5
- 2.Sfxe5#
- 2.Be2#
- 1...Rf5
- 2.Be2#
- 1...Bb1
- 2.Qb3#
- 1...c5!
- 1...Kd3
- 1.Bd3+?
- 1...Rxd3
- 2.Sfe5#
- 1...Kxd3!
- 1...Rxd3
- 1.Bc1?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rg5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- 1...Rxd6
- 1.Bd2?
- threat
- 2.Qb4#
- 1...Rxd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rb5
- 2.Qc3#
- 2.Qd4#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- threat
- 1.Be3?
- threat
- 2.Sb6#
- 1...Bb3
- 2.Qxb3#
- 1...Rd4
- 2.Sfe5#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rh5+!
- threat
- 1.Bf4?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rg5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- 1...Rxd6
- 1.Bf6?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qc3#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rg5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- 1...Rxd6
- 1.Bh6?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rg5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- 1...Rxd6
- 1.Be7?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rg5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- 1...Rxd6
- 1.Bd8?
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sxd2#
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 1...Ra5
- 2.Sd2#
- 1...Rb5
- 2.Sd2#
- 2.Qd4#
- 1...Rc5
- 2.Sd2#
- 2.Sb6#
- 1...Re5
- 2.Sd2#
- 2.Sfxe5#
- 1...Rf5
- 2.Sd2#
- 1...Rg5
- 2.Sd2#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Rh5+!
- 1...Rxd6
- 1.Qa3?
- 1...Kb5
- 2.Qa4#
- 1...Rxg5
- 2.Bd3#
- 1...Rxd6
- 2.Qc5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Bxd3#
- 2.Qc5#
- 1...Rd1
- 2.Qc5#
- 1...Rd2
- 2.Qc5#
- 1...Rd4
- 2.Qc5#
- 1...Ra5
- 2.Bd3#
- 1...Rb5
- 2.Bd3#
- 1...Rc5
- 2.Bd3#
- 2.Qxc5#
- 1...Re5
- 2.Bd3#
- 1...Rf5
- 2.Bd3#
- 1...Bb1
- 2.Qb3#
- 1...c5!
- 1...Kb5
- 1.Qd4+?
- 1...Kb5
- 2.Qa4#
- 1...Rxd4!
- 1...Kb5
- 1.Qxa2+?
- 1...Kc3
- 2.Qb3#
- 1...Kb5
- 2.Qa4#
- 1...Kb4!
- 1...Kc3
- 1.exd5?
- 1...cxd5
- 2.Sd2#
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Sb6#
- 1...Kxd5!
- 1...cxd5
- 1.Kh3?
- Keys
- 1.Ba4!
- 1...Kd3
- 2.Qc2#
- 1...Rxg5
- 2.Qd4#
- 1...Rxd6
- 2.Sfe5#
- 1...Bb3
- 2.Qxb3#
- 1...Rd3
- 2.Sfe5#
- 1...Rd1
- 2.Sfe5#
- 1...Rd2
- 2.Sfe5#
- 1...Rd4
- 2.Sfe5#
- 2.Qxd4#
- 1...Ra5
- 2.Qd4#
- 1...Rb5
- 2.Qd4#
- 1...Rc5
- 2.Qd4#
- 1...Re5
- 2.Sfxe5#
- 2.Qd4#
- 1...Rf5
- 2.Qd4#
- 1...Bb1
- 2.Qb3#
- 1...c5
- 2.Bb5#
- 1...Kd3
- 1.Ba4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 4
- ADDED MATES = 4
- REMOVED MATES = 1
- Sets
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- R(c);N_GUARD,XB(F)::S(C)
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A)
- B(a);N_GUARD::QAB1(A),XB(a)
- P(d);SBLOCK::S(H)
- Tries
- Try
- K(E);P-FLIGHT
- Vars
- R(c);N_GUARD,XB(F)::S(C)
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);P_PINS(C)
- Try
- K(E);P-FLIGHT
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK,XB(F)
- Try
- K(E);P-FLIGHT,P_SPINB(F)
- Vars
- R(c);N_GUARD,N_PINB(F),XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD,N_PINB(F)::S(C)
- R(c);N_GUARD::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK,XB(F)
- Try
- B(B);
- Vars
- K(b);S_FLIGHT::QAB1(A)
- R(c);N_GUARD,XB(B)::S(C)
- R(c);N_GUARD,XB(F)::B(B)
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- R(c);N_GUARD::B(B)
- B(a);N_GUARD::QAB1(A)
- Refutation
- P(d);
- Try
- B(B);CHECK
- Vars
- R(c);XB(B)::S(C)
- Refutation
- K(b);S_FLIGHT,XB(B)
- Try
- B(F);
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Threat
- QAR1(A)
- Vars
- B(a);N_GUARD::QAB1(A),XB(a)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Threat
- S(H)
- Vars
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD,P_PINP(D)::S(C)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- B(F);
- Vars
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD,P_PINP(D)::S(C)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- R(c);CHECK
- Try
- Q(A);
- Vars
- K(b);S_FLIGHT::QAB1(A)
- R(c);N_GUARD,XB(F)::B(B)
- R(c);N_GUARD,XP(G)::QAR1(A)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::QAR1(A)
- R(c);N_GUARD,P_PINP(D)::QAR1(A)
- R(c);N_GUARD::B(B)
- R(c);N_GUARD,SBLOCK::B(B)
- B(a);N_GUARD::QAB1(A)
- Refutation
- P(d);
- Try
- Q(A);CHECK
- Vars
- K(b);OGATE,S_FLIGHT::QAB1(A)
- Refutation
- R(c);P_PINP(D),XQ(A)
- Try
- Q(A);CHECK,XB(a)
- Vars
- K(b);P-FLIGHT::QAR1(A)
- K(b);S_FLIGHT::QAB1(A)
- Refutation
- K(b);P-FLIGHT
- Try
- P(D);XR(c)
- Vars
- B(a);N_GUARD::QAB1(A),XB(a)
- B(a);N_GUARD::QAB1(A)
- P(d);SBLOCK::S(H)
- Refutation
- K(b);S_FLIGHT,XP(D)
- Try
- Actual
- B(B);
- Vars
- K(b);S_FLIGHT::QAB1(A)
- R(c);N_GUARD,XB(F)::QAR1(A)
- R(c);N_GUARD,XP(G)::S(C)
- B(a);N_GUARD::QAB1(A),XB(a)
- R(c);N_GUARD::S(C)
- R(c);N_GUARD::QAR1(A)
- B(a);N_GUARD::QAB1(A)
- P(d);N_GUARD,S_CUTR(c)::B(B)
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).