MESON Chess Problem Database

Problem Display
PID: 12024 (8/6n1/QPp5/Pp1RK3/2k2p2/1Rp1p3/nB6/N7 w - - 0 1)

Wilson, Francis Vaux

The Problemist, 1973

8/6n1/QPp5/Pp1RK3/2k2p2/1Rp1p3/nB6/N7

#2

8 + 8

SOLUTION

  • SOUND
  • Sets
    • 1...Sb4
      • 2.Rxc3#
    • 1...cxd5
      • 2.Qxb5#
    • 1...c5
      • 2.Qxb5#
  • Tries
    • 1.Rxc3+?
      • 1...Kb4
        • 2.Rd4#
      • 1...Sxc3!
    • 1.Rbxb5?
      • threat
        • 2.Rb3#
        • 2.Rd4#
      • 1...cxb2
        • 2.Rb3#
      • 1...cxb5
        • 2.Qxb5#
      • 1...Sb4
        • 2.Rbc5#
        • 2.Rd4#
      • 1...Sf5
        • 2.Rb3#
      • 1...Se6
        • 2.Rb3#
      • 1...c5
        • 2.Rb3#
      • 1...cxd5!
    • 1.Qc8?
      • threat
        • 2.Qxc6#
      • 1...Sb4
        • 2.Rxc3#
      • 1...c5
        • 2.Rd4#
        • 2.Qxc5#
      • 1...Se6!
    • 1.b7?
      • threat
        • 2.Qxc6#
      • 1...cxd5
        • 2.Qxb5#
      • 1...Sb4
        • 2.Rxc3#
      • 1...c5
        • 2.Qxb5#
      • 1...Se6!
  • Keys
    • 1.Rdxb5!
      • threat
        • 2.Rd5#
      • 1...Kd3
        • 2.Rd5#
      • 1...cxb5
        • 2.Qxb5#
      • 1...Sb4
        • 2.Rxc3#
      • 1...c5
        • 2.R5b4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • S(a);N_GUARD,SBLOCK::R1(C),XP(b)
    • P(g);N_GUARD,XR(E)::QAB1(G),XP(f)
    • P(g);N_GUARD::QAB1(G),XP(f)
  • Tries
    • Try
      • R(C);CHECK,XP(b)
      • Vars
        • K(d);N_SPINP(f),P-FLIGHT::R(E)
      • Refutation
        • S(a);XR(C)
    • Try
      • R(C);XP(f)
      • Threat
        • DUALS(2)
      • Vars
        • P(b);XB(B)::QAB(G)+R(C)
        • P(g);OGATE,P_SPINP(g),XR(C)::QAB1(G),XP(g)
        • S(h);::QAB(G)+R(C)
        • P(g);::QAB(G)+R(C)
      • Refutation
        • P(g);XR(E)
    • Try
      • Q(G);N_PINP(f),P_PINP(g)
      • Threat
        • QAR2(G),XP(g)
      • Vars
        • S(a);N_GUARD,SBLOCK::R1(C),XP(b)
      • Refutation
        • S(h);
    • Try
      • P(H);
      • Threat
        • QAR2(G),XP(g)
      • Vars
        • P(g);N_GUARD,XR(E)::QAB1(G),XP(f)
        • S(a);N_GUARD,SBLOCK::R1(C),XP(b)
        • P(g);N_GUARD::QAB1(G),XP(f)
      • Refutation
        • S(h);
  • Actual
    • R(E);XP(f)
    • Threat
      • QAB(G)+R(E)
    • Vars
      • K(d);P_SPINP(b),S_FLIGHT::QAB(G)+R(E),DCHECK
      • P(g);OGATE,P_SPINP(g),XR(E)::QAB1(G),XP(g)
      • S(a);N_GUARD::R1(C),XP(b)
      • P(g);SBLOCK::QAB(G)+R(E),DCHECK
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