MESON Chess Problem Database

Problem Display
PID: 16315 (2b5/2r1p3/8/1R1Pn1p1/4P2p/2k5/BpNp1NQ1/1Kbr4 w - - 0 1)

Andrade, Barry Jack da Costa

Chess, 1940

2b5/2r1p3/8/1R1Pn1p1/4P2p/2k5/BpNp1NQ1/1Kbr4

#2

8 + 11

SOLUTION

  • SOUND
  • Sets
    • 1...Rc4
      • 2.Rb3#
    • 1...Sd3
      • 2.Sxd1#
    • 1...Sf3
      • 2.Qxf3#
    • 1...Sc4
      • 2.Rb3#
    • 1...Sc6
      • 2.Rc5#
      • 2.Qf3#
    • 1...Sg6
      • 2.Qf3#
    • 1...Sd7
      • 2.Qf3#
      • 2.Qh3#
    • 1...Sf7
      • 2.Qf3#
  • Tries
    • 1.Rc5+?
      • 1...Sc4
        • 2.Qf3#
      • 1...Rxc5!
    • 1.Qf1?
      • threat
        • 2.Sxd1#
        • 2.Rb3#
      • 1...Re1
        • 2.Rb3#
      • 1...Rb7
        • 2.Sxd1#
      • 1...Bg4
        • 2.Rb3#
      • 1...Sd3
        • 2.Sxd1#
        • 2.Qxd3#
      • 1...Rxf1!
    • 1.Qf3+?
      • 1...Sd3
        • 2.Sxd1#
        • 2.Qxd3#
      • 1...Sxf3!
    • 1.Qh3+?
      • 1...Sd3
        • 2.Sxd1#
        • 2.Qxd3#
      • 1...Sf3
        • 2.Qxf3#
      • 1...Bxh3!
    • 1.Qg3+?
      • 1...Sd3
        • 2.Sxd1#
        • 2.Qxd3#
      • 1...Sf3
        • 2.Qxc7#
        • 2.Qxf3#
      • 1...hxg3!
  • Keys
    • 1.Qh2!
      • threat
        • 2.Qxe5#
      • 1...Rc4
        • 2.Rb3#
      • 1...Sd3
        • 2.Sxd1#
      • 1...Sf3
        • 2.Qxc7#
      • 1...Sc4
        • 2.Rb3#
      • 1...Sg4
        • 2.Qxc7#
      • 1...Sc6
        • 2.Rc5#
      • 1...Sg6
        • 2.Qxc7#
      • 1...Sd7
        • 2.Qh3#
      • 1...Sf7
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 3
    • ADDED MATES = 3
    • REMOVED MATES = 0
  • Sets
    • R(i);SBLOCK::R1(G)
    • S(g);SBLOCK::S(D),XR(b)
    • S(g);N_GUARD::QAR(E),XS(g)
    • S(g);SBLOCK::R1(G)
    • S(g);N_GUARD::QAR(E)
  • Tries
    • Try
      • R(G);CHECK
      • Vars
        • S(g);P_SPINS(g)::QAR(E)
      • Refutation
        • R(i);XR(G)
    • Try
      • Q(E);
      • Threat
        • DUALS(2)
      • Vars
        • R(b);::R1(G)
        • R(i);::S(D),XR(b)
        • B(k);::R1(G)
      • Refutation
        • R(b);XQ(E)
    • Try
      • Q(E);CHECK
      • Refutation
        • S(g);XQ(E)
    • Try
      • Q(E);CHECK
      • Vars
        • S(g);N_GUARD,P_SPINS(g)::QAR(E),XS(g)
      • Refutation
        • B(k);XQ(E)
    • Try
      • Q(E);CHECK
      • Refutation
        • P(f);XQ(E)
  • Actual
    • Q(E);
    • Threat
      • QAB(E),XS(g)
    • Vars
      • R(i);SBLOCK::R1(G)
      • S(g);SBLOCK::S(D),XR(b)
      • S(g);OGATE::QAR(E),XR(i)
      • S(g);SBLOCK::R1(G)
      • S(g);N_GUARD,S_CUTR(i)::R(G)
      • S(g);N_GUARD,S_CUTB(k)::QAR(E)
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