MESON Chess Problem Database
Problem Display
PID: 21452 (8/6p1/3p2B1/nN1K4/1R6/b2N1Qp1/P1kr1pP1/5R2 w - - 0 1)
Gevers, Raymond
6th Prize, Chess Amateur (The), 1919
#2
9 + 8
| 2681 | All Change Here! | 1919 |
SOLUTION
- SOUND
- Sets
- 1...Rd1
- 2.Qxd1#
- 1...Re2
- 2.Qxe2#
- 1...Rxd3+
- 2.Qxd3#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Bxb4
- 2.Rc1#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 1...Sb7
- 2.Rc4#
- 1...Rd1
- Tries
- 1.Kd4?
- threat
- 2.Sxa3#
- 1...Rxd3+
- 2.Qxd3#
- 1...Bb2+
- 2.Rxb2#
- 1...Sc6+
- 2.Qxc6#
- 1...Bxb4
- 2.Rc1#
- 1...Rd1
- 2.Qxd1#
- 1...Re2
- 2.Qxe2#
- 1...Bc1
- 2.Rxc1#
- 1...Sc4
- 2.Rxc4#
- 1...Sb3+!
- threat
- 1.Ke4?
- 1...Re2+
- 2.Qxe2#
- 1...Rxd3
- 2.Qxd3#
- 1...Bxb4
- 2.Rc1#
- 1...Rd1
- 2.Qxd1#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 1...Sb7
- 2.Rc4#
- 1...d5+!
- 1...Re2+
- 1.Ke6?
- 1...Re2+
- 2.Qxe2#
- 1...Rxd3
- 2.Qd1#
- 2.Qe2#
- 2.Qxd3#
- 1...Bxb4
- 2.Rc1#
- 1...Rd1
- 2.Qxd1#
- 1...Bc1
- 2.Se1#
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 2.Qxc6#
- 1...Sb7
- 2.Rc4#
- 1...d5!
- 1...Re2+
- 1.Rb3?
- threat
- 2.Sxa3#
- 2.Sd4#
- 2.Rc3#
- 1...Rxd3+
- 2.Qxd3#
- 1...Rd1
- 2.Qxd1#
- 1...Re2
- 2.Qxe2#
- 1...Bc1
- 2.Sd4#
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Bb4
- 2.Sd4#
- 2.Rc1#
- 2.Rb2#
- 1...Bc5
- 2.Rc1#
- 2.Rb2#
- 2.Rc3#
- 1...Sc4
- 2.Sd4#
- 2.Rc3#
- 1...Sc6
- 2.Sxa3#
- 2.Rc3#
- 1...Sxb3!
- threat
- 1.Qe2?
- 1...Bxb4
- 2.Rc1#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 1...Sb7
- 2.Rc4#
- 1...Rxe2!
- 1...Bxb4
- 1.Qe4?
- 1...Rxd3+
- 2.Qxd3#
- 1...Bxb4
- 2.Rc1#
- 1...Re2
- 2.Qxe2#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 2.Qc4#
- 1...Sc4
- 2.Rxc4#
- 2.Qxc4#
- 1...Sc6
- 2.Rc4#
- 2.Qc4#
- 1...Sb7
- 2.Rc4#
- 2.Qc4#
- 1...Rd1!
- 1...Rxd3+
- 1.Qg4?
- 1...Bxb4
- 2.Rc1#
- 1...Rd1
- 2.Qxd1#
- 1...Re2
- 2.Qxe2#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 2.Qc4#
- 1...Sc4
- 2.Rxc4#
- 2.Qxc4#
- 1...Sc6
- 2.Rc4#
- 2.Qc4#
- 1...Sb7
- 2.Rc4#
- 2.Qc4#
- 1...Rxd3+!
- 1...Bxb4
- 1.Qh5?
- 1...Bxb4
- 2.Rc1#
- 1...Rd1
- 2.Qxd1#
- 1...Re2
- 2.Qxe2#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 1...Sb7
- 2.Rc4#
- 1...Rxd3+!
- 1...Bxb4
- 1.Qe3?
- 1...Rxd3+
- 2.Bxd3#
- 2.Qxd3#
- 1...Bxb4
- 2.Rc1#
- 1...Re2
- 2.Sc1#
- 2.Sb2#
- 2.Sxf2#
- 2.Sf4#
- 2.Sc5#
- 2.Se5#
- 2.Qxe2#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Rxb2#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 1...Sb7
- 2.Rc4#
- 1...Rd1!
- 1...Rxd3+
- 1.Kd4?
- Keys
- 1.Rd4!
- 1...Rxd3
- 2.Qe2#
- 1...Rd1
- 2.Qxd1#
- 1...Re2
- 2.Qxe2#
- 1...Bc1
- 2.Rxc1#
- 1...Bb2
- 2.Sb4#
- 1...Bb4
- 2.Rc1#
- 1...Bc5
- 2.Rc1#
- 1...Sb3
- 2.Rc4#
- 1...Sc4
- 2.Rxc4#
- 1...Sc6
- 2.Rc4#
- 1...Sb7
- 2.Rc4#
- 1...Rxd3
- 1.Rd4!
FEATURES
- Static
- TYPE = MUTATE
- CHANGED MATES = 2
- ADDED MATES = 1
- REMOVED MATES = 0
- Sets
- R(b);N_GUARD::QAB1(E),XR(b)
- R(b);N_PINS(D),OGATEB::QAR2(E),XR(b)
- R(b);CHECK,OGATE,P_SPINR(b),XS(D)::QAB1(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- B(d);N_GUARD,XR(F)::R1(A)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
- Tries
- Try
- K(H);P-FLIGHT
- Threat
- S(G),XB(d)
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XS(D)::QAB1(E),XR(b)
- B(d);CHECK,N_GUARD::R1(F),XB(d)
- S(f);CHECK,N_GUARD::QAR(E),XS(f)
- B(d);N_GUARD,XR(F)::R1(A)
- R(b);N_GUARD::QAB1(E),XR(b)
- R(b);N_PINS(D),OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- S(f);N_GUARD::R(F),XS(f)
- Refutation
- S(f);CHECK
- Try
- K(H);N_SPINS(D),S_FLIGHT
- Vars
- R(b);CHECK,OGATEB::QAR2(E),XR(b)
- R(b);OGATE,XS(D)::QAB1(E),XR(b)
- B(d);N_GUARD,XR(F)::R1(A)
- R(b);N_GUARD::QAB1(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
- Refutation
- P(g);CHECK
- Try
- K(H);N_SPINS(D),S_FLIGHT
- Vars
- R(b);CHECK,OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD,XR(F)::R1(A)
- R(b);N_GUARD::QAB1(E),XR(b)
- B(d);N_GUARD::R1(F),XB(d)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
- Refutation
- P(g);
- Try
- R(F);
- Threat
- DUALS(3)
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XS(D)::QAB1(E),XR(b)
- R(b);N_GUARD::QAB1(E),XR(b)
- R(b);N_PINS(D),OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD::R1(F),XB(d)
- Refutation
- S(f);XR(F)
- Try
- Q(E);P_PINR(b)
- Vars
- B(d);N_GUARD,XR(F)::R1(A)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
- Refutation
- R(b);N_PINS(D),N_SPINR(b),XQ(E)
- Try
- Q(E);
- Vars
- R(b);CHECK,OGATE,P_SPINR(b),XS(D)::QAB1(E),XR(b)
- B(d);N_GUARD,XR(F)::R1(A)
- R(b);N_PINS(D),OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- Refutation
- R(b);
- Try
- Q(E);
- Vars
- B(d);N_GUARD,XR(F)::R1(A)
- R(b);N_GUARD::QAB1(E),XR(b)
- R(b);N_PINS(D),OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- Refutation
- R(b);CHECK,P_SPINR(b),XS(D)
- Try
- Q(E);
- Vars
- B(d);N_GUARD,XR(F)::R1(A)
- R(b);N_GUARD::QAB1(E),XR(b)
- R(b);N_PINS(D),OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
- Refutation
- R(b);CHECK,P_SPINR(b),XS(D)
- Try
- Q(E);
- Vars
- B(d);N_GUARD,XR(F)::R1(A)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);N_GUARD::R1(F),XB(d)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
- Refutation
- R(b);
- Try
- Actual
- R(F);N_SPINS(D)
- Vars
- R(b);OGATEB,P_PINR(F),P_SPINR(b),XS(D)::QAR2(E)
- R(b);N_GUARD::QAB1(E),XR(b)
- R(b);OGATEB::QAR2(E),XR(b)
- B(d);N_GUARD::R1(A),XB(d)
- B(d);SBLOCK::B(I)+S(D),DCHECK
- B(d);N_GUARD::R1(A)
- S(f);N_GUARD::R(F)
- S(f);N_GUARD::R(F),XS(f)
Developed and maintained by Brian Stephenson.
Implemented with HTML5, MySQL, Perl (with, inter alia, CGI::Simple, HTML::Template & XML::LibXML) &
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