MESON Chess Problem Database

Problem Display
PID: 23608 (4r3/8/q7/b1N2pr1/R1p1pkp1/2B1R3/3PKp2/2Q5 w - - 0 1)

Howard, Kenneth Samuel

5th Prize, Guest MT, 1925

4r3/8/q7/b1N2pr1/R1p1pkp1/2B1R3/3PKp2/2Q5

#2

7 + 10

5088 How to Solve Chess Problems 1945
56 The Problemist 1981

SOLUTION

  • SOUND
  • Sets
    • 1...f1Q+
      • 2.Qxf1#
    • 1...f1S
      • 2.Qxf1#
    • 1...f1B+
      • 2.Qxf1#
    • 1...f1R
      • 2.Qxf1#
  • Tries
    • 1.d3?
      • threat
        • 2.Rf3#
      • 1...f1Q+
        • 2.Qxf1#
      • 1...f1B+
        • 2.Qxf1#
      • 1...cxd3+
        • 2.Rxd3#
      • 1...exd3+
        • 2.Sxd3#
      • 1...g3
        • 2.Rxe4#
      • 1...Bxc3!
  • Keys
    • 1.d4!
      • threat
        • 2.Rf3#
      • 1...f1Q+
        • 2.Qxf1#
      • 1...f1B+
        • 2.Qxf1#
      • 1...cxd4 ep+
        • 2.Rxd3#
      • 1...exd4 ep+
        • 2.Sxd3#
      • 1...g3
        • 2.Rxe4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 2
  • Sets
    • P(a);CHECK,OGATEB::QAR(A),XQ(a)
    • P(a);OGATEB::QAR(A),XS(a)
    • P(a);CHECK,OGATEB::QAR(A),XB(a)
    • P(a);OGATEB::QAR(A),XR(a)
  • Tries
    • Try
      • P(B);
      • Threat
        • QAB(A)+R(E),DCHECK
      • Vars
        • P(a);CHECK,OGATEB::QAR(A),XQ(a)
        • P(a);CHECK,OGATEB::QAR(A),XB(a)
        • P(b);CHECK,OGATE,P_SPINP(c),XP(B)::QAB(A)+R(E),XP(b)
        • P(c);CHECK,P_PINR(E),P_SPINP(b),XP(B)::S(G),XP(c)
        • P(e);SBLOCK::QAB(A)+R(E),DCHECK,XP(c)
      • Refutation
        • B(f);XB(D)
  • Actual
    • P(B);
    • Threat
      • QAB(A)+R(E),DCHECK
    • Vars
      • P(a);CHECK,OGATEB::QAR(A),XQ(a)
      • P(a);CHECK,OGATEB::QAR(A),XB(a)
      • P(b);CHECK,EP,P_SPINP(c),XP(B)::QAB(A)+R(E),XP(b)
      • P(c);CHECK,EP,N_GUARD,P_PINR(E),P_SPINP(b),XP(B)::S(G),XP(c)
      • P(e);SBLOCK::QAB(A)+R(E),DCHECK,XP(c)
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