MESON Chess Problem Database
Problem Display
PID: 108598 (1K6/1n1k1P2/p4RNb/B1PNp3/1Rr1B3/5n2/1qb1Q3/8 w - - 0 1)
Karlstrom, Alfred Olaf
1st HM., US Chess Federation, 1945-47
#2
10 + 9
| 6490 | yacpdb | 2009 |
| 133 | The Problemist Supplement | 2011 |
SOLUTION
- SOUND
- Sets
- 1...Qa1
- 2.Rxb7#
- 1...Qc1
- 2.Rxb7#
- 1...Qa3
- 2.Rxb7#
- 1...Qc3
- 2.Rxb7#
- 1...Qd4
- 2.Rxb7#
- 1...Qa2
- 2.Rxb7#
- 1...Rxb4
- 2.c6#
- 1...Rd4
- 2.c6#
- 1...Rxe4
- 2.c6#
- 1...Bd1
- 2.Bf5#
- 1...Bb3
- 2.Bf5#
- 2.Rxb7#
- 1...Ba4
- 2.Bf5#
- 1...Bc1
- 2.Sf8#
- 1...Bd2
- 2.Sf8#
- 1...Be3
- 2.Sf8#
- 1...Bf4
- 2.Sf8#
- 1...Bg5
- 2.Sf8#
- 1...Bf8
- 2.Sxf8#
- 1...Se1
- 2.Qg4#
- 1...Sg1
- 2.Qg4#
- 1...Sd2
- 2.Qg4#
- 1...Sd4
- 2.Sxe5#
- 1...Sxa5
- 2.Rd6#
- 1...Sd6
- 2.Rxd6#
- 1...Sd8
- 2.Sb6#
- 2.Rd6#
- 1...Qa1
- Tries
- 1.Bc7?
- threat
- 2.Sb6#
- 1...Rxb4
- 2.c6#
- 1...Qxb4!
- threat
- 1.Rxa6?
- threat
- 2.Sf6#
- 1...Sxa5
- 2.Rd6#
- 1...Sd6
- 2.Rxd6#
- 1...Bg5
- 2.Sf8#
- 1...Bg7!
- threat
- 1.Qd3?
- threat
- 2.Sb6#
- 2.Bf5#
- 1...Rxe4
- 2.Sb6#
- 2.c6#
- 1...Sxa5
- 2.Sb6#
- 2.Rd6#
- 1...Sxc5
- 2.Sb6#
- 1...Sd6
- 2.Rxd6#
- 1...Qd4
- 2.Bf5#
- 2.Rxb7#
- 1...Rd4
- 2.Bf5#
- 2.c6#
- 1...Sd4
- 2.Sxe5#
- 1...Sh4
- 2.Sb6#
- 1...Sg5
- 2.Sb6#
- 1...Sd8
- 2.Sb6#
- 2.Rd6#
- 1...Bxd3!
- threat
- 1.Qxc4?
- threat
- 2.c6#
- 1...Sxa5
- 2.Rd6#
- 1...Ba4
- 2.Bf5#
- 1...Sd4
- 2.Sxe5#
- 1...Sd8
- 2.Sb6#
- 2.Rd6#
- 1...Sxc5!
- threat
- 1.Qxc2?
- threat
- 2.Bf5#
- 2.Qa4#
- 1...Qxc2
- 2.Rxb7#
- 1...Qxb4
- 2.Bf5#
- 1...Rxc2
- 2.Bf5#
- 1...Rxb4
- 2.Bf5#
- 2.c6#
- 1...Rxe4
- 2.Qa4#
- 2.c6#
- 1...Rxc5
- 2.Bf5#
- 1...Sxa5
- 2.Rd6#
- 1...Sd6
- 2.Rxd6#
- 1...Qa1
- 2.Bf5#
- 2.Rxb7#
- 1...Qa3
- 2.Bf5#
- 2.Rxb7#
- 1...Qa2
- 2.Bf5#
- 2.Rxb7#
- 1...Qb3
- 2.Bf5#
- 1...Sd4
- 2.Sxe5#
- 1...Sh4
- 2.Qa4#
- 1...Sg5
- 2.Qa4#
- 1...Sd8
- 2.Sb6#
- 2.Rd6#
- 1...Sxc5!
- threat
- 1.f8Q?
- threat
- 2.Sb6#
- 2.Qe7#
- 2.Qf7#
- 2.Qc8#
- 1...Qxb4
- 2.Qe7#
- 2.Qf7#
- 2.Qc8#
- 1...Rxb4
- 2.Qe7#
- 2.Qf7#
- 2.Qc8#
- 2.c6#
- 1...Rxc5
- 2.Sb6#
- 2.Qe7#
- 2.Qf7#
- 1...Sxa5
- 2.Sb6#
- 2.Rd6#
- 2.Qe7#
- 2.Qc8#
- 1...Sd6
- 2.Sb6#
- 2.Rxd6#
- 1...Sg5
- 2.Sb6#
- 2.Qe7#
- 2.Qc8#
- 1...Sd8
- 2.Sb6#
- 2.Rd6#
- 2.Qe7#
- 2.Qxd8#
- 1...Bxf8!
- threat
- 1.Bc7?
- Keys
- 1.Qd1!
- threat
- 2.Sb6#
- 1...Bxd1
- 2.Bf5#
- 1...Sd6
- 2.Rxd6#
- 1...Qd4
- 2.Rxb7#
- 1...Rd4
- 2.c6#
- 1...Bd3
- 2.Qa4#
- 1...Bd2
- 2.Sf8#
- 1...Sd2
- 2.Qg4#
- 1...Sd4
- 2.Sxe5#
- threat
- 1.Qd1!
FEATURES
- Static
- TYPE = THREAT
- CHANGED MATES = 0
- ADDED MATES = 1
- REMOVED MATES = 16
- Sets
- Q(a);N_GUARD::R(B),XS(h)
- R(d);N_GUARD,XR(B)::P(E)
- R(d);N_GUARD::P(E)
- R(d);N_GUARD,XB(C)::P(E)
- B(b);N_GUARD::B(C)
- B(g);N_GUARD::S(H)
- B(g);N_GUARD::S(H),XB(g)
- S(c);OGATE::QAB(A)
- S(c);N_GUARD,S_CUTQ(a)::S(H),XP(e)
- S(h);N_GUARD,P_PINR(B),XB(D)::R1(G)
- S(h);N_GUARD,P_PINR(B)::R1(G),XS(h)
- Tries
- Try
- B(D);
- Threat
- S(F)
- Vars
- R(d);N_GUARD,XR(B)::P(E)
- Refutation
- Q(a);XR(B)
- Try
- R(G);XP(f)
- Threat
- S(F)
- Vars
- S(h);N_GUARD,P_PINR(B),XB(D)::R1(G)
- S(h);N_GUARD,P_PINR(B)::R1(G),XS(h)
- B(g);N_GUARD::S(H)
- Refutation
- B(g);
- Try
- Q(A);
- Threat
- DUALS(2)
- Vars
- S(h);P_PINR(B),XP(E)::QAR(A)+S(F),DCHECK
- S(h);N_GUARD,P_PINR(B)::R1(G),XS(h)
- S(c);N_GUARD,S_CUTQ(a)::S(H),XP(e)
- S(c);::QAR(A)+S(F),DCHECK
- Refutation
- B(b);XQ(A)
- Try
- Q(A);XR(d)
- Threat
- P(E)
- Vars
- S(h);N_GUARD,P_PINR(B),XB(D)::R1(G)
- B(b);N_GUARD::B(C)
- S(c);N_GUARD,S_CUTQ(a)::S(H),XP(e)
- Refutation
- S(h);P_PINR(B),XP(E)
- Try
- Q(A);XB(b)
- Threat
- DUALS(2)
- Vars
- Q(a);N_GUARD,XQ(A)::R(B),XS(h)
- Q(a);XR(B)::B(C)
- R(d);XQ(A)::B(C)
- R(d);XP(E)::B(C)
- S(h);N_GUARD,P_PINR(B),XB(D)::R1(G)
- S(h);N_GUARD,P_PINR(B)::R1(G),XS(h)
- Q(a);::B(C)
- S(c);N_GUARD,S_CUTQ(a)::S(H),XP(e)
- S(c);::QAB(A)
- Refutation
- S(h);P_PINR(B),XP(E)
- Try
- P(I);
- Threat
- DUALS(4)
- Refutation
- B(g);XQ(I)
- Try
- Actual
- Q(A);
- Threat
- QAR(A)+S(F),DCHECK
- Vars
- B(b);N_GUARD,XQ(A)::B(C)
- S(h);N_GUARD,P_PINR(B)::R1(G),XS(h)
- Q(a);N_GUARD::R(B),XS(h)
- R(d);N_GUARD::P(E)
- B(b);OGATE::QAB(A)
- B(g);N_GUARD::S(H)
- S(c);OGATE::QAB(A)
- S(c);N_GUARD,S_CUTQ(a)::S(H),XP(e)
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