MESON Chess Problem Database

Problem Display
PID: 257900 (B1NnN3/pr2p2K/6Q1/3k4/3P2Pp/1P3Pq1/8/4r1B1 w - - 0 1)

Andrade, Barry Jack da Costa

British Chess Magazine, 1934

B1NnN3/pr2p2K/6Q1/3k4/3P2Pp/1P3Pq1/8/4r1B1

#2

10 + 8

3713 Snap 2022

SOLUTION

  • SOUND
  • Sets
    • 1...Qc7
      • 2.Sxc7#
    • 1...Qg2
      • 2.Sc7#
    • 1...Qxf3
      • 2.Sc7#
    • 1...Qh3
      • 2.Sc7#
    • 1...Qxg4
      • 2.Sc7#
    • 1...Ra1
      • 2.Sxe7#
      • 2.Qe4#
    • 1...Rb1
      • 2.Sxe7#
      • 2.Qe4#
    • 1...Rc1
      • 2.Sxe7#
      • 2.Qe4#
    • 1...Rd1
      • 2.Sxe7#
      • 2.Qe4#
    • 1...Rf1
      • 2.Sxe7#
      • 2.Qe4#
    • 1...Rxg1
      • 2.Qe4#
    • 1...Re4
      • 2.Qxe4#
      • 2.fxe4#
    • 1...Re5
      • 2.Sc7#
    • 1...Se6
      • 2.Sxe7#
      • 2.Bxb7#
    • 1...Sf7
      • 2.Bxb7#
    • 1...a5
      • 2.Sb6#
    • 1...a6
      • 2.Sb6#
    • 1...e5+
      • 2.Se7#
      • 2.Sc7#
    • 1...e6+
      • 2.Se7#
  • Tries
    • 1.Bxb7+?
      • 1...Sc6
        • 2.Bxc6#
        • 2.Qxc6#
      • 1...Sxb7!
    • 1.Qf5+?
      • 1...Qe5
        • 2.Sxe7#
      • 1...Re5
        • 2.Sxe7#
        • 2.Qd7#
      • 1...e5+
        • 2.Se7#
        • 2.Qd7#
      • 1...Kc6!
    • 1.Qa6?
      • threat
        • 2.Qc4#
      • 1...e5+
        • 2.Se7#
        • 2.Sc7#
      • 1...e6+
        • 2.Se7#
      • 1...Qc7
        • 2.Sxc7#
      • 1...Rc1
        • 2.Sxe7#
      • 1...Qxf3!
  • Keys
    • 1.Qc2!
      • threat
        • 2.Qc4#
      • 1...e5+
        • 2.Sc7#
      • 1...e6+
        • 2.Se7#
      • 1...Ke6
        • 2.Qf5#
      • 1...Qxf3
        • 2.Sc7#
      • 1...Qc7
        • 2.Sxc7#
      • 1...Rc1
        • 2.Qe4#

This anticipates 94792(1953)

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 8
  • Sets
    • Q(b);N_GUARD::S(J),XQ(b)
    • Q(b);N_GUARD::S(J)
    • Q(b);N_GUARD,XP(C)::S(J)
    • Q(b);N_GUARD,XP(E)::S(J)
    • R(a);N_GUARD,XB(A)::QAB1(F)
    • R(a);S_CUTQ(b)::S(J)
    • S(h);N_GUARD::B(H),XR(f)
    • P(e);N_GUARD::S(I)
    • P(g);CHECK,S_CUTR(a)::S(I)
  • Tries
    • Try
      • B(H);CHECK,XR(f)
      • Refutation
        • S(h);XB(H)
    • Try
      • Q(F);CHECK
      • Vars
        • Q(b);P_SPINQ(b)::S(I),XP(g)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(F);
      • Threat
        • QAB1(F)
      • Vars
        • P(g);CHECK,S_CUTR(a)::S(I)
        • Q(b);N_GUARD::S(J),XQ(b)
        • R(a);N_GUARD::S(I),XP(g)
      • Refutation
        • Q(b);XP(C)
  • Actual
    • Q(F);
    • Threat
      • QAB1(F)
    • Vars
      • P(g);CHECK,S_CUTQ(b)::S(J)
      • P(g);CHECK,SBLOCK,S_CUTR(a)::S(I)
      • K(d);N_GUARD,N_SPINR(f),S_CUTP(g),S_CUTQ(b),S_CUTR(a),S_FLIGHT::QAB1(F)
      • Q(b);N_GUARD,XP(C)::S(J)
      • Q(b);N_GUARD::S(J),XQ(b)
      • R(a);N_GUARD::QAB1(F)
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