MESON Chess Problem Database

Problem Display
PID: 152945 (8/b7/8/3pr2p/B1p2Q1K/3kP2R/3pN1R1/B2n4 w - - 0 1)

Harley, Brian

Rains, Cyril George

The Observer, 1934

(First published on Sun Nov 18 1934)

8/b7/8/3pr2p/B1p2Q1K/3kP2R/3pN1R1/B2n4

#2

8 + 8

15290 Harley Scrapbook 2014
15239 Valois Notebooks 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Rxe3
      • 2.Qf5#
    • 1...Rf5
      • 2.Qxf5#
    • 1...Bxe3
      • 2.Qd4#
    • 1...Bd4
      • 2.Qxd4#
    • 1...Bb8
      • 2.Qd4#
  • Tries
    • 1.Sd4?
      • threat
        • 2.Bc2#
      • 1...Bxd4
        • 2.Qxd4#
      • 1...c3
        • 2.Bb5#
      • 1...Sb2!
    • 1.Qxe5?
      • threat
        • 2.Sf4#
        • 2.Qf5#
      • 1...Sf2
        • 2.Sf4#
      • 1...Sc3
        • 2.Sf4#
      • 1...c3!
    • 1.Qe4+?
      • 1...Kxe4
        • 2.Bc2#
      • 1...dxe4
        • 2.Sf4#
      • 1...Rxe4+!
    • 1.Qf5+?
      • 1...Re4+
        • 2.Sf4#
      • 1...Rxf5!
  • Keys
    • 1.Qf1!
      • threat
        • 2.Sc3#
      • 1...Re4+
        • 2.Sf4#
      • 1...Ke4
        • 2.Bc2#
      • 1...Rxe3
        • 2.Qf5#
      • 1...Bxe3
        • 2.Sg3#
      • 1...Sxe3
        • 2.Qb1#
      • 1...c3
        • 2.Sxc3#
      • 1...Rf5
        • 2.Qxf5#
      • 1...Sb2
        • 2.Qb1#
      • 1...Sc3
        • 2.Sxc3#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 6
    • REMOVED MATES = 2
  • Sets
    • R(f);N_GUARD,P_SPINR(f),XP(D)::QAB(G)
    • R(f);N_GUARD::QAB(G),XR(f)
    • B(h);N_GUARD,P_SPINB(h),XP(D)::QAR1(G)
    • B(h);N_GUARD::QAR1(G),XB(h)
    • B(h);N_GUARD::QAR1(G)
  • Tries
    • Try
      • S(B);
      • Threat
        • B(F)
      • Vars
        • B(h);OGATE,XS(B)::QAR1(G),XB(h)
        • P(d);OGATEB::B(F)
      • Refutation
        • S(a);
    • Try
      • Q(G);XR(f)
      • Threat
        • DUALS(2)
      • Vars
        • S(a);::S(B)
      • Refutation
        • P(d);
    • Try
      • Q(G);CHECK
      • Vars
        • K(c);S_FLIGHT,XQ(G)::B(F)
        • P(e);SBLOCK,XQ(G)::S(B)
      • Refutation
        • R(f);CHECK,XQ(G)
    • Try
      • Q(G);CHECK
      • Vars
        • R(f);CHECK,P_SPINR(f)::S(B)
      • Refutation
        • R(f);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • QAB(G)+S(B)
    • Vars
      • R(f);CHECK,SBLOCK::QAB(G)+S(B),DCHECK
      • K(c);S_FLIGHT::B(F)
      • R(f);N_GUARD,P_SPINR(f),XP(D)::QAB(G)
      • B(h);P_SPINB(h),SBLOCK,XP(D)::QAB(G)+S(B)
      • S(a);OGATE,P_SPINS(a),XP(D)::QAB(G)
      • P(d);::QAB(G)+S(B),XP(d)
      • R(f);N_GUARD::QAB(G),XR(f)
      • S(a);OGATE::QAB(G)
      • S(a);::QAB(G)+S(B),XS(a)
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