MESON Chess Problem Database

Problem Display
PID: 196897 (7B/Q3bR1p/1Pp4r/4PN2/2K1k2r/1ppN1pP1/1q3P2/7R w - - 0 1)

Ellerman, Arnoldo

American Chess Bulletin, 1919

7B/Q3bR1p/1Pp4r/4PN2/2K1k2r/1ppN1pP1/1q3P2/7R

#2

11 + 10

6490 yacpdb 2019

SOLUTION

  • SOUND
  • Sets
    • 1...Qa3
      • 2.Re1#
    • 1...Qxf2
      • 2.Sxf2#
    • 1...Rd6
      • 2.Sc5#
    • 1...Bc5
      • 2.Sxc5#
    • 1...Bg5
      • 2.Sc5#
    • 1...Bf6
      • 2.Sd6#
    • 1...Bd8
      • 2.Sc5#
    • 1...c2
      • 2.Re1#
  • Tries
    • 1.Sd6+?
      • 1...Rxd6
        • 2.Sc5#
      • 1...Bxd6!
    • 1.Rxh4+?
      • 1...Bxh4
        • 2.Sc5#
      • 1...Rxh4!
  • Keys
    • 1.Qd7!
      • threat
        • 2.Qd4#
      • 1...Qxf2
        • 2.Sxf2#
      • 1...Rd6
        • 2.Sc5#
      • 1...Rf6
        • 2.Rxh4#
      • 1...Bc5
        • 2.Sxc5#
      • 1...Bd6
        • 2.Qxc6#
      • 1...Bf6
        • 2.Sd6#
      • 1...c2
        • 2.Re1#
      • 1...c5
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 3
  • Sets
    • Q(a);N_GUARD::R(A)
    • Q(a);XP(B)::S(C),XQ(a)
    • R(h);S_CUTB(i)::S(C)
    • B(i);N_GUARD::S(C),XB(i)
    • B(i);N_GUARD::S(C)
    • B(i);N_GUARD,S_CUTR(h)::S(G)
    • P(c);S_CUTQ(a)::R(A)
  • Tries
    • Try
      • S(G);CHECK
      • Vars
        • R(h);XS(G)::S(C)
      • Refutation
        • B(i);XS(G)
    • Try
      • R(A);CHECK,XR(f)
      • Vars
        • B(i);XR(A)::S(C)
      • Refutation
        • R(h);XR(A)
  • Actual
    • Q(I);
    • Threat
      • QAR1(I)
    • Vars
      • Q(a);XP(B)::S(C),XQ(a)
      • R(h);S_CUTB(i)::S(C)
      • R(h);N_GUARD,S_CUTB(i)::R(A),XR(f)
      • B(i);N_GUARD::S(C),XB(i)
      • B(i);S_CUTR(h)::QAB(I),XP(g)
      • B(i);N_GUARD,S_CUTR(h)::S(G)
      • P(c);S_CUTQ(a)::R(A)
      • P(g);N_GUARD::QAB1(I)
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