MESON Chess Problem Database

Problem Display
PID: 69942 (Br6/1qR2P2/r1n1NK2/2Pk4/p7/1Ppn1P2/N1Q5/b2R1b2 w - - 0 1)

Bonavia-Hunt, Rev Noel Aubrey

Chess, 1949

Br6/1qR2P2/r1n1NK2/2Pk4/p7/1Ppn1P2/N1Q5/b2R1b2

#2

11 + 10

SOLUTION

  • SOUND
  • Sets
    • 1...Qxa8
      • 2.Rd7#
    • 1...Qb4
      • 2.Rd7#
    • 1...Qb5
      • 2.Rd7#
    • 1...Qb6
      • 2.Rd7#
    • 1...Sb4
      • 2.Sxb4#
    • 1...Sa5
      • 2.Sb4#
    • 1...Se5
      • 2.Sb4#
    • 1...Sa7
      • 2.Sb4#
    • 1...Se7
      • 2.Sb4#
    • 1...Sd8
      • 2.Sb4#
  • Tries
    • 1.Sb4+?
      • 1...Qxb4
        • 2.Rd7#
      • 1...Sxb4!
    • 1.Sf4+?
      • 1...Kd4
        • 2.Qf2#
      • 1...Kxc5!
    • 1.Bxb7?
      • threat
        • 2.Sb4#
        • 2.Rd7#
      • 1...axb3
        • 2.Qxb3#
      • 1...Rb6
        • 2.Rd7#
      • 1...Rd8
        • 2.Sb4#
      • 1...Rxb7!
    • 1.Rxd3+?
      • 1...Sd4
        • 2.Sb4#
        • 2.Rxd4#
      • 1...Bxd3!
    • 1.Qxd3+?
      • 1...Sd4
        • 2.Sb4#
        • 2.Qe4#
        • 2.Qf5#
        • 2.Qxd4#
      • 1...Bxd3!
  • Keys
    • 1.Qxc3!
      • threat
        • 2.Sf4#
      • 1...Bxc3+
        • 2.Sxc3#
      • 1...Qxc7
        • 2.Sxc7#
      • 1...Qb4
        • 2.Rd7#
      • 1...Sb4
        • 2.Sxb4#
      • 1...Sd4
        • 2.Qc4#
      • 1...Sa5
        • 2.Sb4#
      • 1...Se5
        • 2.Sb4#
      • 1...Sa7
        • 2.Sb4#
      • 1...Se7
        • 2.Sb4#
      • 1...Sd8
        • 2.Sb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(i);N_GUARD,XB(K)::R(I)
    • Q(i);N_GUARD::R(I)
    • S(h);N_GUARD,P_PINS(G),P_SPINQ(i)::S(B),XS(h)
    • S(h);N_GUARD,P_PINS(G),P_SPINQ(i)::S(B)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • Q(i);XS(B)::R(I)
      • Refutation
        • S(h);P_PINS(G),P_SPINQ(i),XS(B)
    • Try
      • S(G);CHECK
      • Vars
        • K(f);P-FLIGHT::QAB(C)
      • Refutation
        • K(f);N_SPINS(d),P-FLIGHT,P_SPINP(c),P_SPINS(h),XP(F)
    • Try
      • B(K);XQ(i)
      • Threat
        • DUALS(2)
      • Vars
        • P(e);OGATE,XP(D)::QAB(C),XP(e)
        • R(g);::R(I)
        • R(j);::S(B)
      • Refutation
        • R(j);XB(K)
    • Try
      • R(A);CHECK,XS(d)
      • Refutation
        • B(b);XR(A)
    • Try
      • Q(C);CHECK,XS(d)
      • Refutation
        • B(b);P_SPINB(b),XQ(C)
  • Actual
    • Q(C);P_SPINQ(C),XP(c)
    • Threat
      • S(G)
    • Vars
      • B(a);CHECK,XQ(C)::S(B),XB(a)
      • Q(i);XR(I)::S(G),XQ(i)
      • Q(i);N_GUARD::R(I)
      • S(h);N_GUARD,P_PINS(G),P_SPINQ(i)::S(B),XS(h)
      • S(h);N_PINQ(C),N_SPINS(d),P_PINS(G),P_SPINQ(i)::QAB1(C)
      • S(h);N_GUARD,P_PINS(G),P_SPINQ(i)::S(B)
      • S(h);N_GUARD,N_PINQ(C),P_PINS(G),P_SPINQ(i)::S(B)
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