MESON Chess Problem Database

Problem Display
PID: 87601 (3n1Q2/pR1pNp2/3k1B2/r1n4K/1p3pB1/4N3/2R3p1/5b2 w - - 0 1)

Lancia, Ugo

American Chess Problemist, 1951

3n1Q2/pR1pNp2/3k1B2/r1n4K/1p3pB1/4N3/2R3p1/5b2

#2

8 + 11

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Bc4
      • 2.Sxc4#
    • 1...Sb3+
      • 2.S7d5#
    • 1...Sd3+
      • 2.S7d5#
    • 1...Sa4+
      • 2.S7d5#
    • 1...Se4+
      • 2.S7d5#
    • 1...Sa6+
      • 2.S7d5#
    • 1...Sce6+
      • 2.S7f5#
    • 1...Scxb7+
      • 2.S7d5#
    • 1...Sc6
      • 2.Sc8#
    • 1...Sde6
      • 2.S3f5#
    • 1...Sdxb7
      • 2.Qb8#
  • Tries
    • 1.S7f5+?
      • 1...Ke6
        • 2.Qd6#
        • 2.Qe7#
      • 1...Kc6!
    • 1.Rd2+?
      • 1...Bd3
        • 2.Sc4#
      • 1...Sd3+!
    • 1.Rb6+?
      • 1...Kc7
        • 2.S3d5#
      • 1...Sc6
        • 2.S7d5#
        • 2.Qb8#
      • 1...axb6!
  • Keys
    • 1.Rc4!
      • threat
        • 2.Rd4#
      • 1...Sb3+
        • 2.S7d5#
      • 1...Sd3+
        • 2.S7d5#
      • 1...Sa4+
        • 2.S7d5#
      • 1...Se4+
        • 2.S7d5#
      • 1...Sa6+
        • 2.S7d5#
      • 1...Sce6+
        • 2.S7f5#
      • 1...Scxb7+
        • 2.S7d5#
      • 1...Bxc4
        • 2.Sxc4#
      • 1...Sdxb7
        • 2.Qb8#
      • 1...Sc6
        • 2.Sc8#
      • 1...Sde6
        • 2.S3f5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 0
    • REMOVED MATES = 0
  • Sets
    • B(a);N_GUARD::S(B),XB(a)
    • S(f);CHECK::QAB(H)+S(G)
    • S(f);CHECK,SBLOCK::QAB(H)+S(G),DCHECK
    • S(f);CHECK,XR(F)::QAB(H)+S(G)
    • S(k);SBLOCK::QAB(H)+S(G),DCHECK
    • S(k);SBLOCK::S(B)
    • S(k);OGATE,XR(F)::QAB(H)
  • Tries
    • Try
      • S(G);CHECK
      • Refutation
        • K(g);P-FLIGHT,P_SPINS(f)
    • Try
      • R(A);CHECK
      • Vars
        • B(a);P_SPINB(a)::S(B)
      • Refutation
        • S(f);CHECK,P_SPINS(f)
    • Try
      • R(F);CHECK
      • Vars
        • K(g);P_SPINS(f),S_FLIGHT::S(B)
      • Refutation
        • P(h);XR(F)
  • Actual
    • R(A);
    • Threat
      • R(A)
    • Vars
      • S(f);CHECK::QAB(H)+S(G)
      • S(f);CHECK,SBLOCK::QAB(H)+S(G),DCHECK
      • S(f);CHECK,XR(F)::QAB(H)+S(G)
      • B(a);XR(A)::S(B),XB(a)
      • S(k);OGATE,XR(F)::QAB(H)
      • S(k);SBLOCK::QAB(H)+S(G),DCHECK
      • S(k);SBLOCK::S(B)
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