MESON Chess Problem Database

Problem Display
PID: 275454 (RbB5/nNp5/k6p/B6r/2RN4/6Qp/7K/7b w - - 0 1)

Andrade, Barry Jack da Costa

British Chess Magazine, 1935

RbB5/nNp5/k6p/B6r/2RN4/6Qp/7K/7b

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Rc6#
    • 1...Bc6
      • 2.Rxc6#
  • Tries
    • 1.Bxc7?
      • threat
        • 2.Sc5#
      • 1...Bxb7
        • 2.Rc6#
        • 2.Qd6#
        • 2.Qg6#
      • 1...Rc5
        • 2.Sxc5#
      • 1...Bxc7!
    • 1.Qe1?
      • threat
        • 2.Sc5#
      • 1...c6+
        • 2.Sd6#
      • 1...Rxa5
        • 2.Qxa5#
      • 1...Bxb7
        • 2.Rc6#
      • 1...Rc5
        • 2.Sxc5#
      • 1...c5+!
    • 1.Qxc7?
      • threat
        • 2.Sc5#
      • 1...Bxb7
        • 2.Bxb7#
        • 2.Rc6#
      • 1...Rc5
        • 2.Sxc5#
      • 1...Bxc7+!
    • 1.Qc3?
      • threat
        • 2.Sc5#
      • 1...c6+
        • 2.Sd6#
      • 1...Rxa5
        • 2.Qxa5#
      • 1...Bxb7
        • 2.Rc6#
      • 1...Rc5
        • 2.Sxc5#
      • 1...c5+!
    • 1.Qg6+?
      • 1...Bc6
        • 2.Rxc6#
        • 2.Qxc6#
      • 1...c6+!
  • Keys
    • 1.Qa3!
      • threat
        • 2.Sc5#
      • 1...c5+
        • 2.Bc7#
      • 1...c6+
        • 2.Sd6#
      • 1...Rxa5
        • 2.Qxa5#
      • 1...Bxb7
        • 2.Rc6#
      • 1...Rc5
        • 2.Sxc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 5
    • REMOVED MATES = 2
  • Sets
    • R(c);S_CUTB(a)::R(C)
    • B(a);N_GUARD::R(C),XB(a)
  • Tries
    • Try
      • B(E);XP(g)
      • Threat
        • B(H)+S(F),DCHECK
      • Vars
        • R(c);::B(H)+S(F),DCHECK,XR(c)
      • Refutation
        • B(h);P_PINQ(B),XB(E)
    • Try
      • Q(B);
      • Threat
        • B(H)+S(F),DCHECK
      • Vars
        • P(g);CHECK,S_CUTB(a)::B(H)+S(F)
        • R(c);OGATE,XB(E)::QAR1(B),XR(c)
        • B(a);N_GUARD,P_SPINB(a),XS(F)::R(C)
        • R(c);::B(H)+S(F),DCHECK,XR(c)
      • Refutation
        • P(g);CHECK
    • Try
      • Q(B);P_SPINQ(B),XP(g)
      • Threat
        • B(H)+S(F),DCHECK
      • Vars
        • R(c);::B(H)+S(F),DCHECK,XR(c)
      • Refutation
        • B(h);CHECK,XQ(B)
    • Try
      • Q(B);
      • Threat
        • B(H)+S(F),DCHECK
      • Vars
        • P(g);CHECK,S_CUTB(a)::B(H)+S(F)
        • R(c);OGATE,XB(E)::QAR1(B),XR(c)
        • B(a);N_GUARD,P_SPINB(a),XS(F)::R(C)
        • R(c);::B(H)+S(F),DCHECK,XR(c)
      • Refutation
        • P(g);CHECK
    • Try
      • Q(B);CHECK
      • Refutation
        • P(g);CHECK,P_SPINP(g)
  • Actual
    • Q(B);
    • Threat
      • B(H)+S(F),DCHECK
    • Vars
      • P(g);CHECK,S_CUTR(c)::QAR(B)+B(E)
      • P(g);CHECK,S_CUTB(a)::B(H)+S(F)
      • R(c);OGATE,P_SPINR(c),XB(E)::QAR1(B),XR(c)
      • B(a);N_GUARD,P_SPINB(a),XS(F)::R(C)
      • R(c);::B(H)+S(F),DCHECK,XR(c)
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