MESON Chess Problem Database

Problem Display
PID: 188346 (8/5p2/QK1pP3/5N2/2R1N3/1p1k2p1/2R2p1b/1rr2n1b w - - 0 1)

Andrade, Barry Jack da Costa

The Observer, 1937

(First published on Sun May 30 1937)

8/5p2/QK1pP3/5N2/2R1N3/1p1k2p1/2R2p1b/1rr2n1b

#2

7 + 11

15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxc2
      • 2.Rd4#
    • 1...Bxe4
      • 2.R4c3#
      • 2.Rc5#
      • 2.Rc6#
      • 2.Rc7#
      • 2.Rc8#
    • 1...Sd2
      • 2.Rxd2#
    • 1...Se3
      • 2.Rd2#
    • 1...bxc2+
      • 2.Rb4#
    • 1...b2
      • 2.Qa3#
    • 1...g2
      • 2.Sxf2#
    • 1...d5
      • 2.Sc5#
  • Tries
    • 1.Ka5?
      • threat
        • 2.Qxd6#
      • 1...Rxc2
        • 2.Rd4#
      • 1...Bxe4
        • 2.R4c3#
        • 2.Rc5#
        • 2.Rc6#
        • 2.Rc7#
        • 2.Rc8#
      • 1...bxc2
        • 2.Rb4#
        • 2.Rd4#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Se3
        • 2.Rd2#
      • 1...g2
        • 2.Sxf2#
      • 1...d5
        • 2.Sc5#
      • 1...Ra1+!
    • 1.Ka7?
      • threat
        • 2.Qxd6#
      • 1...Rxc2
        • 2.Rd4#
      • 1...Bxe4
        • 2.R4c3#
        • 2.Rc5#
        • 2.Rc6#
        • 2.Rc7#
        • 2.Rc8#
      • 1...bxc2
        • 2.Rb4#
        • 2.Rd4#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Se3
        • 2.Rd2#
      • 1...g2
        • 2.Sxf2#
      • 1...d5
        • 2.Sc5#
      • 1...Ra1!
    • 1.Kc7?
      • threat
        • 2.Qxd6#
      • 1...Bxe4
        • 2.R4c3#
        • 2.Rc5#
        • 2.Rc6#
      • 1...bxc2
        • 2.Rb4#
        • 2.Rd4#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Se3
        • 2.Rd2#
      • 1...g2
        • 2.Sxf2#
      • 1...d5
        • 2.Sc5#
      • 1...Rxc2!
    • 1.Rxc1?
      • threat
        • 2.Ra4#
        • 2.Rb4#
        • 2.Rd4#
      • 1...Ke2
        • 2.R4c3#
      • 1...Bxe4
        • 2.R4c2#
        • 2.Rd4#
      • 1...Ra1
        • 2.Ra4#
        • 2.Rd4#
      • 1...Sd2
        • 2.Rd4#
      • 1...Se3
        • 2.Rd4#
      • 1...Rxc1!
    • 1.Qb5?
      • threat
        • 2.Qd5#
      • 1...Rxc2
        • 2.Rd4#
      • 1...Bxe4
        • 2.R4c3#
        • 2.Rc5#
        • 2.Rc6#
        • 2.Rc7#
        • 2.Rc8#
      • 1...bxc2
        • 2.Rb4#
        • 2.Rd4#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Se3
        • 2.Rd2#
      • 1...d5
        • 2.Sc5#
        • 2.Qxd5#
      • 1...fxe6!
  • Keys
    • 1.Kb7!
      • threat
        • 2.Qxd6#
      • 1...Bxe4+
        • 2.Rc6#
      • 1...bxc2+
        • 2.Rb4#
      • 1...Rxc2
        • 2.Rd4#
      • 1...Sd2
        • 2.Rxd2#
      • 1...Se3
        • 2.Rd2#
      • 1...g2
        • 2.Sxf2#
      • 1...d5
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 1
    • REMOVED MATES = 1
  • Sets
    • R(b);SBLOCK,XR(A)::QAB(E)+R(B),DCHECK
    • S(c);N_GUARD::R1(A),XS(c)
    • S(c);N_GUARD::R1(A)
    • P(g);CHECK,SBLOCK,XR(A)::QAB(E)+R(B)
    • P(g);OGATEB::QAR(E)
    • P(i);N_GUARD::S(C),XP(e)
    • P(j);N_GUARD::S(C)
  • Tries
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAR(E),XP(j)
      • Vars
        • R(b);SBLOCK,XR(A)::QAB(E)+R(B),DCHECK
        • S(c);N_GUARD::R1(A),XS(c)
        • S(c);N_GUARD::R1(A)
        • P(i);N_GUARD::S(C),XP(e)
        • P(j);N_GUARD::S(C)
      • Refutation
        • R(a);CHECK
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAR(E),XP(j)
      • Vars
        • R(b);SBLOCK,XR(A)::QAB(E)+R(B),DCHECK
        • S(c);N_GUARD::R1(A),XS(c)
        • S(c);N_GUARD::R1(A)
        • P(i);N_GUARD::S(C),XP(e)
        • P(j);N_GUARD::S(C)
      • Refutation
        • R(a);P_PINQ(E)
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAR(E),XP(j)
      • Vars
        • S(c);N_GUARD::R1(A),XS(c)
        • S(c);N_GUARD::R1(A)
        • P(i);N_GUARD::S(C),XP(e)
        • P(j);N_GUARD::S(C)
      • Refutation
        • R(b);P_PINR(B),XR(A)
    • Try
      • R(A);XR(b)
      • Threat
        • DUALS(3)
      • Vars
        • K(h);S_FLIGHT::QAB(E)+R(B)
        • S(c);::QAB(E)+R(B),DCHECK
      • Refutation
        • R(a);XR(A)
    • Try
      • Q(E);
      • Threat
        • QAR2(E)
      • Vars
        • R(b);SBLOCK,XR(A)::QAB(E)+R(B),DCHECK
        • S(c);N_GUARD::R1(A),XS(c)
        • S(c);N_GUARD::R1(A)
      • Refutation
        • P(k);XP(G)
  • Actual
    • K(F);P-FLIGHT,P_SPINS(C)
    • Threat
      • QAR(E),XP(j)
    • Vars
      • B(d);CHECK,SBLOCK,XS(C)::QAB(E)+R(B)
      • P(g);CHECK,SBLOCK,XR(A)::QAB(E)+R(B)
      • R(b);SBLOCK,XR(A)::QAB(E)+R(B),DCHECK
      • S(c);N_GUARD::R1(A),XS(c)
      • S(c);N_GUARD::R1(A)
      • P(i);N_PINS(C)::S(C),XP(e)
      • P(j);N_PINS(C)::S(C)
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