MESON Chess Problem Database
Problem Display
PID: 162 (KN1r4/PP2pP1P/8/4k1P1/3R1pb1/3p3q/B2P1NQb/B3r3 w - - 0 1)
Lertoria, Ernest
British Chess Magazine, 1950
#2
13 + 9
SOLUTION
- SOUND
- Sets
- 1...Rxa1
- 2.Qe4#
- 1...Rb1
- 2.Qe4#
- 1...Rc1
- 2.Qe4#
- 1...Rd1
- 2.Qe4#
- 1...Rf1
- 2.Qe4#
- 1...Rg1
- 2.Qe4#
- 1...Rh1
- 2.Qe4#
- 1...Re4
- 2.Qxe4#
- 1...Rxd4
- 2.Qd5#
- 1...Rd5
- 2.Qxd5#
- 1...Rc8
- 2.Qd5#
- 1...Re8
- 2.Qd5#
- 1...Rf8
- 2.Qd5#
- 1...Rg8
- 2.Qd5#
- 1...Rh8
- 2.Qd5#
- 1...Be2
- 2.Qe4#
- 1...Be6
- 2.Rd5#
- 1...Bd7
- 2.Qd5#
- 1...e6
- 2.Rd5#
- 1...Rxa1
- Tries
- 1.Rxd3+?
- 1...Rxa1
- 2.Qe4#
- 1...Rd4
- 2.Qd5#
- 1...Kf5!
- 1...Rxa1
- 1.Rd6+?
- 1...Kxd6
- 2.Qc6#
- 1...Rxa1
- 2.Qd5#
- 1...Kf5!
- 1...Kxd6
- 1.Rd7+?
- 1...Rxa1
- 2.Qe4#
- 2.Qd5#
- 1...Kf5!
- 1...Rxa1
- 1.Rxd8+?
- 1...Rxa1
- 2.Qe4#
- 2.Qd5#
- 1...Kf5!
- 1...Rxa1
- 1.Rxd3+?
- Keys
- 1.f8Q!
- 1...Rxb8+
- 2.axb8Q#
- 2.axb8B#
- 1...Qxg2
- 2.Sxd3#
- 2.h8Q#
- 2.h8B#
- 1...Qxh7
- 2.Sxg4#
- 1...Rxa1
- 2.Qe4#
- 1...Rxd4
- 2.Qd5#
- 1...Rxf8
- 2.Qd5#
- 1...Rd5
- 2.Qxd5#
- 1...Qe3
- 2.Sxg4#
- 2.h8Q#
- 2.h8B#
- 1...Qf3
- 2.h8Q#
- 2.h8B#
- 1...Qg3
- 2.h8Q#
- 2.h8B#
- 1...Qh4
- 2.Sxd3#
- 1...Qh5
- 2.Sxd3#
- 1...Qh6
- 2.Sxd3#
- 2.Sxg4#
- 1...Rb1
- 2.Qe4#
- 1...Rc1
- 2.Qe4#
- 1...Rd1
- 2.Qe4#
- 1...Rf1
- 2.Qe4#
- 1...Rg1
- 2.Qe4#
- 1...Rh1
- 2.Qe4#
- 1...Re2
- 2.Rd7#
- 2.Rxd8#
- 1...Re3
- 2.Rd7#
- 2.Rxd8#
- 1...Re4
- 2.Qxe4#
- 1...Rd6
- 2.Re4#
- 1...Rd7
- 2.Sc6#
- 1...Rc8
- 2.Qd5#
- 1...Re8
- 2.Qd5#
- 1...Bg1
- 2.Qxf4#
- 1...Bg3
- 2.Sxd3#
- 1...Bd1
- 2.Rd7#
- 2.Rxd8#
- 1...Be2
- 2.Qe4#
- 1...Bf3
- 2.Sxd3#
- 1...Bf5
- 2.Qg7#
- 1...Bh5
- 2.h8Q#
- 2.h8B#
- 1...Be6
- 2.Rd5#
- 1...Bd7
- 2.Qd5#
- 1...Bc8
- 2.Sc6#
- 1...f3
- 2.Sxd3#
- 1...e6
- 2.Re4#
- 2.Rd5#
- 2.Qf6#
- 1...Rxb8+
- 1.f8Q!
FEATURES
- Static
- TYPE = INCOMPLETE_BLOCK
- CHANGED MATES = 0
- ADDED MATES = 11
- REMOVED MATES = 3
- Sets
- R(a);N_GUARD,XB(A)::QAR1(E)
- R(a);N_GUARD::QAR1(E)
- R(a);N_GUARD::QAR1(E),XR(a)
- R(i);N_GUARD,N_PINS(M),P_SPINR(i),XR(F)::QAR1(E)
- R(i);N_GUARD,N_PINS(M)::QAR1(E),XR(i)
- R(i);N_GUARD::QAR1(E)
- B(f);S_CUTR(a)::QAR1(E)
- B(f);SBLOCK::B(A)+R(F),DCHECK
- B(f);S_CUTR(i)::QAR1(E)
- P(h);SBLOCK::B(A)+R(F),DCHECK
- Tries
- Try
- R(F);CHECK,XP(c)
- Vars
- R(a);XB(A)::QAR1(E)
- R(i);N_PINS(M),P_SPINR(i)::QAR1(E)
- Refutation
- K(g);P-FLIGHT
- Try
- R(F);CHECK
- Vars
- K(g);S_FLIGHT,XR(F)::QAR1(E)
- R(a);XB(A)::QAR1(E)
- Refutation
- K(g);P-FLIGHT
- Try
- R(F);CHECK
- Refutation
- K(g);P-FLIGHT
- Try
- R(F);CHECK,N_SPINS(M),XR(i)
- Refutation
- K(g);P-FLIGHT
- Try
- Actual
- P(J);
- Vars
- R(i);CHECK,OGATE,XS(M)::PXR(i)=Q
- Q(d);N_GUARD,XP(K)::S(D),XB(f)
- R(a);N_GUARD,XB(A)::QAR1(E)
- R(i);N_GUARD,N_PINS(M),P_SPINR(i),XR(F)::QAR1(E)
- R(i);N_GUARD,XQ(J)::QAR1(E)
- R(i);N_GUARD,N_PINS(M)::QAR1(E),XR(i)
- Q(d);N_GUARD,P_PINP(I)::P=Q
- Q(d);N_GUARD::P=Q
- Q(d);N_GUARD::S(D),XP(c)
- R(a);N_GUARD::QAR1(E)
- R(a);N_GUARD::QAR1(E),XR(a)
- R(i);N_PINS(M),SBLOCK::B(A)+R(F),DCHECK
- R(i);N_PINS(M)::S(M)
- R(i);N_GUARD::QAR1(E)
- B(b);N_GUARD::QAB1(J),XP(e)
- B(b);S_CUTQ(d)::S(D),XP(c)
- B(f);S_CUTR(a)::QAR1(E)
- B(f);P_PINP(I),S_CUTQ(d)::S(D),XP(c)
- B(f);SBLOCK::QAB(J)
- B(f);S_CUTQ(d)::P=Q
- B(f);SBLOCK::B(A)+R(F),DCHECK
- B(f);S_CUTR(i)::QAR1(E)
- B(f);N_PINS(M)::S(M)
- P(e);S_CUTQ(d)::S(D),XP(c)
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