MESON Chess Problem Database

Problem Display
PID: 18041 (8/8/3PNK1p/p4N1B/2Qpk3/r7/6n1/b7 w - - 0 1)

Sprague, Gordon

Time & Tide, 1952

8/8/3PNK1p/p4N1B/2Qpk3/r7/6n1/b7

#2

6 + 7

SOLUTION

  • SOUND
  • Sets
    • 1...Rc3
      • 2.Qxd4#
    • 1...Rd3
      • 2.Qc6#
    • 1...Se3
      • 2.Sg3#
    • 1...Sf4
      • 2.Sc5#
  • Tries
    • 1.Sg3+?
      • 1...Ke3
        • 2.Qe2#
      • 1...Rxg3!
    • 1.Qe2+?
      • 1...Re3
        • 2.Bf3#
      • 1...Se3
        • 2.Bf3#
      • 1...Kd5!
    • 1.Qc2+?
      • 1...Kd5
        • 2.Sc7#
      • 1...Rd3
        • 2.Qc6#
      • 1...d3+!
  • Keys
    • 1.Be2!
      • threat
        • 2.Qc6#
      • 1...Rc3
        • 2.Qxd4#
      • 1...Se3
        • 2.Sg3#
      • 1...Sf4
        • 2.Sc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 1
  • Sets
    • R(c);S_CUTB(a)::QAR1(A),XP(d)
    • R(c);SBLOCK::QAB(A)
    • S(b);SBLOCK,S_CUTR(c)::S(B)
    • S(b);SBLOCK::S(E)
  • Tries
    • Try
      • S(B);CHECK
      • Vars
        • K(e);N_SPINP(d),P-FLIGHT::QAR1(A)
      • Refutation
        • R(c);XS(B)
    • Try
      • Q(A);CHECK,N_PINP(d)
      • Vars
        • R(c);P_SPINR(c)::B(C)
        • S(b);P_SPINS(b)::B(C)
      • Refutation
        • K(e);S_FLIGHT
    • Try
      • Q(A);CHECK,N_PINP(d)
      • Vars
        • K(e);S_FLIGHT::S(E)
        • R(c);P_SPINR(c),SBLOCK::QAB(A)
      • Refutation
        • P(d);CHECK,P_SPINP(d)
  • Actual
    • B(C);
    • Threat
      • QAB(A)
    • Vars
      • R(c);S_CUTB(a)::QAR1(A),XP(d)
      • S(b);SBLOCK,S_CUTR(c)::S(B)
      • S(b);SBLOCK::S(E)
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