MESON Chess Problem Database
Problem Display
PID: 72308 (2bR2B1/b7/5R2/r3P1p1/2Nnk3/pn1p3p/8/B4Q1K w - - 0 1)
O'Keefe, John James
Chess, 1953
#2
8 + 10
SOLUTION
- SOUND
- Sets
- 1...Ra4
- 2.Bd5#
- 1...Rd5
- 2.Bxd5#
- 1...Ra6
- 2.Bd5#
- 1...Bc5
- 2.Bd5#
- 1...Sc5
- 2.Bd5#
- 2.Rxd4#
- 1...Sc2
- 2.Qxd3#
- 2.Qf3#
- 1...Se2
- 2.Qf3#
- 1...Sf3
- 2.Qxd3#
- 2.Qxf3#
- 1...Sb5
- 2.Bd5#
- 2.Qxd3#
- 2.Qf3#
- 1...Sc6
- 2.Qxd3#
- 2.Qf3#
- 1...Se6
- 2.Bh7#
- 2.Qxd3#
- 2.Qf3#
- 2.Qf5#
- 1...g4
- 2.Rf4#
- 2.Qf4#
- 1...Ra4
- Tries
- 1.Sd6+?
- 1...Ke3
- 2.Qf2#
- 1...Kxe5!
- 1...Ke3
- 1.Rf3?
- threat
- 2.Re3#
- 2.Qxd3#
- 1...Sc1
- 2.Re3#
- 1...Sc5
- 2.Bd5#
- 2.Re3#
- 2.Rxd4#
- 1...Sc2
- 2.Sd6#
- 2.Qxd3#
- 1...Se2
- 2.Sd6#
- 1...Sb5
- 2.Bd5#
- 2.Qxd3#
- 1...Sf5
- 2.Qxd3#
- 1...Sc6
- 2.Sd6#
- 2.Qxd3#
- 1...Se6
- 2.Bh7#
- 2.Qxd3#
- 1...d2
- 2.Re3#
- 2.Qd3#
- 1...Sxf3!
- threat
- 1.Rxd4+?
- 1...Bxd4
- 2.Qf3#
- 1...Sxd4!
- 1...Bxd4
- 1.Qg2+?
- 1...Sf3
- 2.Qxf3#
- 1...hxg2+!
- 1...Sf3
- 1.Qxh3?
- threat
- 2.Qe3#
- 1...Sf5
- 2.Qg4#
- 1...Sc2
- 2.Sd6#
- 2.Qg2#
- 2.Qxd3#
- 2.Qf3#
- 1...Se2
- 2.Sd6#
- 2.Qg2#
- 2.Qxd3#
- 2.Qf3#
- 1...Sf3
- 2.Qxf3#
- 1...Sb5
- 2.Bd5#
- 2.Qg2#
- 2.Qxd3#
- 2.Qf3#
- 1...Sc6
- 2.Sd6#
- 2.Qg2#
- 2.Qxd3#
- 2.Qf3#
- 1...Se6
- 2.Bh7#
- 2.Qg2#
- 2.Qf5#
- 2.Qxd3#
- 2.Qf3#
- 2.Qh7#
- 1...Bxh3!
- threat
- 1.Qf2?
- threat
- 2.Qe3#
- 1...Sc2
- 2.Sd6#
- 2.Qf3#
- 1...Se2
- 2.Sd6#
- 2.Qf3#
- 1...Sf3
- 2.Sd6#
- 2.Qxf3#
- 1...Sb5
- 2.Bd5#
- 2.Qf3#
- 1...Sc6
- 2.Sd6#
- 2.Qf3#
- 1...Se6
- 2.Bh7#
- 2.Qf3#
- 2.Qf5#
- 1...Sf5!
- threat
- 1.Sd6+?
- Keys
- 1.Qg1!
- threat
- 2.Qe3#
- 1...Sf5
- 2.Qg4#
- 1...Sc2
- 2.Sd6#
- 1...Se2
- 2.Sd6#
- 1...Sf3
- 2.Sd6#
- 1...Sb5
- 2.Bd5#
- 1...Sc6
- 2.Sd6#
- 1...Se6
- 2.Bh7#
- threat
- 1.Qg1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 1
- ADDED MATES = 6
- REMOVED MATES = 4
- Sets
- R(g);N_GUARD::B(H)
- R(g);N_GUARD::B(H),XR(g)
- B(i);S_CUTR(g)::B(H)
- S(e);N_GUARD::QAB1(B)
- Tries
- Try
- S(D);CHECK
- Vars
- K(f);P-FLIGHT::QAB1(B)
- Refutation
- K(f);P-FLIGHT,P_SPINS(e),XP(E)
- Try
- R(F);
- Threat
- DUALS(2)
- Vars
- S(b);::R1(F)
- S(e);::S(D)
- S(e);::QAB1(B),XP(c)
- Refutation
- S(e);XR(F)
- Try
- R(G);CHECK,XS(e)
- Vars
- B(i);XR(G)::QAB1(B)
- Refutation
- S(b);XR(G)
- Try
- Q(B);CHECK
- Vars
- S(e);N_GUARD,P_SPINS(e)::QAB1(B),XS(e)
- Refutation
- P(d);CHECK,XQ(B)
- Try
- Q(B);XP(d)
- Threat
- QAR1(B)
- Vars
- S(e);S_CUTB(j)::QAR2(B)
- S(e);N_GUARD::QAB1(B),XS(e)
- Refutation
- B(j);XQ(B)
- Try
- Q(B);
- Threat
- QAR1(B)
- Refutation
- S(e);
- Try
- Actual
- Q(B);
- Threat
- QAR1(B)
- Vars
- S(e);S_CUTB(j)::QAR2(B)
- S(e);::S(D)
- S(e);S_CUTR(g)::B(H)
- S(e);N_GUARD,S_CUTB(j)::B(H)
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