MESON Chess Problem Database

Problem Display
PID: 51375 (r5b1/n7/R2B3b/r1pk1BQ1/N7/P3P2q/K2n4/2R5 w - - 0 1)

Sumner, Christopher Richard Benson

Manchester Guardian, 1958

r5b1/n7/R2B3b/r1pk1BQ1/N7/P3P2q/K2n4/2R5

#2

9 + 9

SOLUTION

  • SOUND
  • Sets
    • 1...Qxf5
      • 2.Qxf5#
    • 1...Rxa4
      • 2.Rxc5#
    • 1...Bf8
      • 2.Qxg8#
    • 1...Sc4
      • 2.Sc3#
    • 1...Sb5
      • 2.Rxc5#
    • 1...Sc8
      • 2.Qxg8#
    • 1...c4
      • 2.Sc3#
  • Tries
    • 1.Be4+?
      • 1...Ke6
        • 2.Qe7#
      • 1...Kxe4+!
    • 1.Bg3?
      • threat
        • 2.Rd6#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Rxa6
        • 2.Rxc5#
      • 1...Rd8
        • 2.Qxd8#
      • 1...Bf8
        • 2.Qxg8#
      • 1...Sc4
        • 2.Sc3#
      • 1...Se4
        • 2.Be6#
      • 1...Sb5
        • 2.Rxc5#
      • 1...Sc6
        • 2.Sb6#
      • 1...Sc8
        • 2.Qxg8#
      • 1...Qxg3!
  • Keys
    • 1.Bf4!
      • threat
        • 2.Rd6#
      • 1...Qxf5
        • 2.Qxf5#
      • 1...Rxa6
        • 2.Rxc5#
      • 1...Rd8
        • 2.Qxd8#
      • 1...Bf8
        • 2.Qxg8#
      • 1...Sc4
        • 2.Sc3#
      • 1...Se4
        • 2.Be6#
      • 1...Sb5
        • 2.Rxc5#
      • 1...Sc6
        • 2.Sb6#
      • 1...Sc8
        • 2.Qxg8#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • Q(b);OGATE,P_SPINQ(b),XB(F)::QAR2(G),XQ(b)
    • R(c);N_GUARD,P_PINP(C),XS(E)::R1(A),XP(d)
    • B(f);S_CUTR(h)::QAB(G),XB(i)
    • S(a);SBLOCK::S(E)
    • S(g);S_CUTR(c)::R1(A),XP(d)
    • S(g);S_CUTR(h)::QAB(G),XB(i)
    • P(d);SBLOCK::S(E)
  • Tries
    • Try
      • B(F);CHECK
      • Vars
        • K(e);S_FLIGHT::QAR1(G)
      • Refutation
        • K(e);CHECK,S_FLIGHT,XB(F)
    • Try
      • B(I);
      • Threat
        • R1(H)
      • Vars
        • Q(b);OGATE,P_SPINQ(b),XB(F)::QAR2(G),XQ(b)
        • R(c);N_GUARD,XR(H)::R1(A),XP(d)
        • R(h);N_GUARD::QAR(G),XR(h)
        • B(f);S_CUTR(h)::QAB(G),XB(i)
        • S(a);SBLOCK::S(E)
        • S(a);SBLOCK::QAR(G)+B(F),DCHECK
        • S(g);S_CUTR(c)::R1(A),XP(d)
        • S(g);SBLOCK::S(E)
        • S(g);S_CUTR(h)::QAB(G),XB(i)
      • Refutation
        • Q(b);XB(I)
  • Actual
    • B(I);
    • Threat
      • R1(H)
    • Vars
      • Q(b);OGATE,P_SPINQ(b),XB(F)::QAR2(G),XQ(b)
      • R(c);N_GUARD,XR(H)::R1(A),XP(d)
      • R(h);N_GUARD::QAR(G),XR(h)
      • B(f);S_CUTR(h)::QAB(G),XB(i)
      • S(a);SBLOCK::S(E)
      • S(a);SBLOCK::QAR(G)+B(F),DCHECK
      • S(g);S_CUTR(c)::R1(A),XP(d)
      • S(g);SBLOCK::S(E)
      • S(g);S_CUTR(h)::QAB(G),XB(i)
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