MESON Chess Problem Database

Problem Display
PID: 272061 (8/p1N4n/8/1pBp2pQ/1Pk2b1R/5R1r/P1pP1Npq/K1n5 w - - 0 1)

Bonavia-Hunt, Rev Noel Aubrey

The Problemist, 1957

8/p1N4n/8/1pBp2pQ/1Pk2b1R/5R1r/P1pP1Npq/K1n5

#2

10 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Rxh4
      • 2.Rc3#
    • 1...Sb3+
      • 2.axb3#
    • 1...d4
      • 2.Qf7#
    • 1...gxh4
      • 2.Qxd5#
    • 1...g4
      • 2.Qxd5#
  • Tries
    • 1.Rfxf4+?
      • 1...d4
        • 2.Rxd4#
        • 2.Qf7#
      • 1...gxf4
        • 2.Qxd5#
      • 1...Qxf4!
    • 1.Rhxf4+?
      • 1...d4
        • 2.Rxd4#
        • 2.Qf7#
      • 1...gxf4
        • 2.Qxd5#
      • 1...Qxf4!
    • 1.Qg6?
      • threat
        • 2.Qxc2#
      • 1...Sb3+
        • 2.axb3#
      • 1...Sxa2
        • 2.Qd3#
      • 1...Se2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Rxf3!
    • 1.Qf7?
      • threat
        • 2.Qxd5#
      • 1...Sb3+
        • 2.axb3#
      • 1...Sf6!
    • 1.Qe8?
      • threat
        • 2.Qxb5#
      • 1...Sb3+
        • 2.axb3#
      • 1...a6!
    • 1.Qxh7?
      • threat
        • 2.Qxc2#
      • 1...Sb3+
        • 2.axb3#
      • 1...Sxa2
        • 2.Qd3#
      • 1...Se2
        • 2.Qd3#
      • 1...Sd3
        • 2.Qxd3#
      • 1...Rxf3!
  • Keys
    • 1.Sg4!
      • threat
        • 2.Se5#
      • 1...Be5+
        • 2.Sxe5#
      • 1...Sb3+
        • 2.axb3#
      • 1...Rxh4
        • 2.Rc3#
      • 1...gxh4
        • 2.Qxd5#
      • 1...Sd3
        • 2.Se3#
      • 1...d4
        • 2.Qf7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 1
  • Sets
    • R(e);N_GUARD,N_SPINB(g),XR(G)::R1(E)
    • S(a);CHECK,OGATE::P(B),XS(a)
    • P(i);N_SPINB(g),OGATEB::QAB(I)
    • P(j);N_SPINB(g),OGATE,XR(G)::QAB1(I),XP(i)
    • P(j);N_SPINB(g),OGATE::QAB1(I),XP(i)
  • Tries
    • Try
      • R(E);CHECK,XB(g)
      • Vars
        • P(j);OGATE,P_SPINP(j),XR(E)::QAB1(I),XP(i)
      • Refutation
        • Q(d);P_SPINQ(d),XR(E)
    • Try
      • R(G);CHECK,XB(g)
      • Vars
        • P(j);OGATE,XR(G)::QAB1(I),XP(i)
      • Refutation
        • Q(d);XR(G)
    • Try
      • Q(I);
      • Threat
        • QAR2(I),XP(b)
      • Vars
        • S(a);CHECK,OGATE::P(B),XS(a)
        • S(a);N_GUARD,XP(B)::QAB1(I)
        • S(a);N_GUARD::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
      • Refutation
        • R(e);XR(E)
    • Try
      • Q(I);P_PINP(i)
      • Threat
        • QAB1(I),XP(i)
      • Vars
        • S(a);CHECK,OGATE::P(B),XS(a)
      • Refutation
        • S(l);
    • Try
      • Q(I);
      • Threat
        • QAB1(I),XP(h)
      • Vars
        • S(a);CHECK,OGATE::P(B),XS(a)
      • Refutation
        • P(k);
    • Try
      • Q(I);XS(l)
      • Threat
        • QAR2(I),XP(b)
      • Vars
        • S(a);CHECK,OGATE::P(B),XS(a)
        • S(a);N_GUARD,XP(B)::QAB1(I)
        • S(a);N_GUARD::QAB1(I)
        • S(a);N_GUARD::QAB1(I),XS(a)
      • Refutation
        • R(e);XR(E)
  • Actual
    • S(D);N_PINB(g)
    • Threat
      • S(D)
    • Vars
      • B(g);CHECK::R(G)+S(D),DCHECK,XB(g)
      • S(a);CHECK,OGATE::P(B),XS(a)
      • R(e);N_GUARD,XR(G)::R1(E)
      • P(j);OGATE,XR(G)::QAB1(I),XP(i)
      • S(a);SBLOCK::S(D)
      • P(i);OGATEB::QAB(I)
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