MESON Chess Problem Database
Problem Display
PID: 493 (8/3p4/3r4/1pR5/1P1k1N2/p2P1P1p/1r1B1N1K/Q1n5 w - - 0 1)
Fenner, A Jack
The Observer, 1957
#2
9 + 8
SOLUTION
- SOUND
- Sets
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Se2
- 2.Sxe2#
- 1...Sb3
- 2.Se2#
- 1...Sxd3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...Rd5
- Tries
- 1.Kh1?
- 1...Sxd3
- 2.Se2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Se2
- 2.Sxe2#
- 1...Sb3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...h2!
- 1...Sxd3
- 1.Kxh3?
- 1...Sxd3
- 2.Se2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Se2
- 2.Sxe2#
- 1...Sb3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...Rh6+!
- 1...Sxd3
- 1.Sh1?
- 1...Sxd3
- 2.Se2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Qg1#
- 1...Sb3
- 2.Qg1#
- 1...a2
- 2.Qxb2#
- 1...Se2!
- 1...Sxd3
- 1.S2xh3?
- 1...Sxd3
- 2.Se2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Qg1#
- 1...Sb3
- 2.Qg1#
- 1...a2
- 2.Qxb2#
- 1...Se2!
- 1...Sxd3
- 1.Se4?
- 1...Sxd3
- 2.Se2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Qg1#
- 1...Sb3
- 2.Qg1#
- 1...a2
- 2.Qxb2#
- 1...Se2!
- 1...Sxd3
- 1.Sg2?
- threat
- 2.Bc3#
- 2.Be3#
- 1...Rd5
- 2.Bc3#
- 1...Se2
- 2.Be3#
- 1...Re6
- 2.Bc3#
- 1...Sa2
- 2.Be3#
- 1...hxg2!
- threat
- 1.Rxb5?
- 1...Rd5
- 2.Rxd5#
- 1...Se2
- 2.Sxe2#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Sb3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...Sxd3!
- 1...Rd5
- 1.Re5?
- threat
- 2.Re4#
- 1...Re6
- 2.Rd5#
- 1...Kxe5!
- threat
- 1.Rf5?
- 1...Se2
- 2.Sxe2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Sb3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...Sxd3!
- 1...Se2
- 1.Rg5?
- 1...Se2
- 2.Sxe2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Sb3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...Sxd3!
- 1...Se2
- 1.Rh5?
- 1...Se2
- 2.Sxe2#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Se2#
- 1...Sb3
- 2.Se2#
- 1...a2
- 2.Qxb2#
- 1...Sxd3!
- 1...Se2
- 1.Qxc1?
- threat
- 2.Se2#
- 2.Bc3#
- 2.Be3#
- 2.Qc3#
- 1...Rxb4
- 2.Se2#
- 2.Be3#
- 2.Qc3#
- 1...Rd5
- 2.Bc3#
- 2.Rxd5#
- 2.Qc3#
- 1...Rc2
- 2.Se2#
- 2.Be3#
- 1...Rb3
- 2.Se2#
- 2.Be3#
- 1...Re6
- 2.Bc3#
- 2.Rd5#
- 2.Qc3#
- 1...Rxd2!
- threat
- 1.Kh1?
- Keys
- 1.Sg4!
- 1...Sxd3
- 2.Se2#
- 1...Se2
- 2.Be3#
- 1...Rd5
- 2.Rxd5#
- 1...Ra6
- 2.Rd5#
- 1...Rb6
- 2.Rd5#
- 1...Rc6
- 2.Rd5#
- 1...Re6
- 2.Rd5#
- 1...Rf6
- 2.Rd5#
- 1...Rg6
- 2.Rd5#
- 1...Rh6
- 2.Rd5#
- 1...Sa2
- 2.Qg1#
- 1...Sb3
- 2.Qg1#
- 1...a2
- 2.Qxb2#
- 1...Sxd3
- 1.Sg4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 3
- ADDED MATES = 0
- REMOVED MATES = 0
- Sets
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- S(a);N_GUARD::S(H),XS(a)
- S(a);N_GUARD,XP(E)::S(H)
- P(c);N_GUARD::QAB(A),XR(b)
- Tries
- Try
- K(D);P-FLIGHT
- Vars
- S(a);N_GUARD,XP(E)::S(H)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- S(a);N_GUARD::S(H),XS(a)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- P(d);
- Try
- K(D);P-FLIGHT,XP(d)
- Vars
- S(a);N_GUARD,XP(E)::S(H)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- S(a);N_GUARD::S(H),XS(a)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- R(g);CHECK
- Try
- S(C);P_SPINB(B)
- Vars
- S(a);N_GUARD,SBLOCK,XP(E)::S(H)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);OGATE::QAB(A)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);N_PINB(B)
- Try
- S(C);P_SPINB(B),XP(d)
- Vars
- S(a);N_GUARD,SBLOCK,XP(E)::S(H)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- R(g);N_GUARD,P_PINS(C)::R1(I)
- S(a);OGATE::QAB(A)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);N_PINB(B)
- Try
- S(C);P_SPINB(B)
- Vars
- S(a);N_GUARD,SBLOCK,XP(E)::S(H)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);OGATE::QAB(A)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);N_PINB(B)
- Try
- S(H);
- Threat
- DUALS(2)
- Vars
- R(g);::B(B)
- S(a);::B(B)
- Refutation
- P(d);XS(H)
- Try
- R(I);XP(f)
- Vars
- R(g);N_GUARD::R1(I),XR(g)
- S(a);N_GUARD::S(H),XS(a)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);XP(E)
- Try
- R(I);
- Threat
- R1(I)
- Vars
- R(g);N_GUARD::R1(I)
- Refutation
- K(e);S_FLIGHT,XR(I)
- Try
- R(I);
- Vars
- S(a);N_GUARD::S(H),XS(a)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);XP(E)
- Try
- R(I);
- Vars
- S(a);N_GUARD::S(H),XS(a)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);XP(E)
- Try
- R(I);
- Vars
- S(a);N_GUARD::S(H),XS(a)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);N_GUARD::S(H)
- P(c);N_GUARD::QAB(A),XR(b)
- Refutation
- S(a);XP(E)
- Try
- Q(A);N_PINR(b),XS(a)
- Threat
- DUALS(4)
- Refutation
- R(b);P_PINS(C),XB(B)
- Try
- Actual
- S(C);P_SPINB(B)
- Vars
- S(a);N_GUARD,SBLOCK,XP(E)::S(H)
- S(a);N_PINB(B)::B(B)
- R(g);N_GUARD::R1(I),XR(g)
- R(g);N_GUARD::R1(I)
- S(a);OGATE::QAB(A)
- P(c);N_GUARD::QAB(A),XR(b)
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Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
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