MESON Chess Problem Database

Problem Display
PID: 16990 (r3r1nb/ppn1pQ2/1pk2pNR/1R6/PPK2B2/N6B/pP6/8 w - - 0 1)

McWilliam, Robert C

Chess, 1945

r3r1nb/ppn1pQ2/1pk2pNR/1R6/PPK2B2/N6B/pP6/8

#2

11 + 12

SOLUTION

  • SOUND
  • Sets
    • 1...Sxb5
      • 2.Qd5#
      • 2.axb5#
    • 1...Sd5
      • 2.Qxd5#
      • 2.Qe6#
    • 1...Sa6
      • 2.Qd5#
      • 2.Qe6#
    • 1...Se6
      • 2.Qxe6#
    • 1...f5
      • 2.Se5#
    • 1...e5
      • 2.Qd7#
    • 1...e6
      • 2.Qxc7#
  • Tries
    • 1.Kb3?
      • threat
        • 2.Qc4#
      • 1...Se6
        • 2.Qxe6#
      • 1...f5
        • 2.Se5#
      • 1...e5
        • 2.Qd7#
      • 1...Sd5
        • 2.Qxd5#
        • 2.Qe6#
      • 1...Sa6
        • 2.Qd5#
        • 2.Qe6#
      • 1...e6
        • 2.Qxc7#
      • 1...a1S+!
    • 1.Bg2+?
      • 1...Sd5
        • 2.Qxd5#
        • 2.Qe6#
      • 1...Kd7!
    • 1.Rd5?
      • threat
        • 2.Se5#
        • 2.Bd7#
      • 1...Sxd5
        • 2.Qxd5#
        • 2.Qe6#
        • 2.b5#
      • 1...Sxh6
        • 2.Bd7#
      • 1...Rad8
        • 2.Se5#
      • 1...Red8
        • 2.Se5#
      • 1...Sb5
        • 2.Bd7#
        • 2.axb5#
      • 1...Sa6
        • 2.Bd7#
        • 2.Qe6#
        • 2.b5#
      • 1...Se6
        • 2.Qxe6#
        • 2.b5#
      • 1...f5
        • 2.Se5#
        • 2.Sxe7#
      • 1...e5
        • 2.Bd7#
        • 2.Qd7#
      • 1...e6
        • 2.Rd6#
        • 2.Qxc7#
        • 2.Qd7#
      • 1...b5+!
  • Keys
    • 1.Kc3!
      • threat
        • 2.Qc4#
      • 1...Sxb5+
        • 2.axb5#
      • 1...Sd5+
        • 2.Qxd5#
      • 1...f5+
        • 2.Se5#
      • 1...Se6
        • 2.Qxe6#
      • 1...e5
        • 2.Qd7#
      • 1...Sa6
        • 2.Qd5#
        • 2.Qe6#
      • 1...e6
        • 2.Qxc7#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 2
    • REMOVED MATES = 0
  • Sets
    • S(g);N_GUARD::QAR2(K),XS(g)
    • P(d);::R(J)+S(I),DCHECK
    • P(h);OGATE::QAB1(K)
    • P(h);OGATE::QAR1(K),XS(g)
  • Tries
    • Try
      • K(F);S_FLIGHT
      • Threat
        • QAR2(K)
      • Vars
        • S(g);N_GUARD::QAR2(K),XS(g)
        • P(d);::R(J)+S(I),DCHECK
        • P(h);OGATE::QAB1(K)
        • P(h);OGATE::QAR1(K),XS(g)
      • Refutation
        • P(a);CHECK
    • Try
      • B(C);CHECK
      • Refutation
        • K(c);P_SPINP(h),S_FLIGHT
    • Try
      • R(H);
      • Threat
        • DUALS(2)
      • Vars
        • S(k);XR(J)::B(C)
        • R(i);::S(I)
        • R(j);::S(I)
      • Refutation
        • P(b);CHECK
  • Actual
    • K(F);P-FLIGHT
    • Threat
      • QAR2(K)
    • Vars
      • S(g);CHECK,OGATE,XR(H)::P(D),XS(g)
      • S(g);CHECK,N_GUARD::QAB1(K),XS(g)
      • P(d);CHECK::R(J)+S(I),DCHECK
      • S(g);N_GUARD::QAR2(K),XS(g)
      • P(h);OGATE::QAB1(K)
      • P(h);OGATE::QAR1(K),XS(g)
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