MESON Chess Problem Database

Problem Display
PID: 233848 (8/K2Pr3/1RBkNQ2/p7/P1p5/1n1r1N2/1n5b/8 w - - 0 1)

Ellerman, Arnoldo

Skakbladet, 1932

8/K2Pr3/1RBkNQ2/p7/P1p5/1n1r1N2/1n5b/8

#2

8 + 8

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rd5
      • 2.Bb5#
    • 1...Rxd7+
      • 2.Bb7#
    • 1...Re8
      • 2.dxe8S#
    • 1...Bg1
      • 2.Qe5#
    • 1...Be5
      • 2.Qxe5#
  • Tries
    • 1.Qf4+?
      • 1...Kxe6
        • 2.Sg5#
      • 1...Bxf4!
  • Keys
    • 1.Qg5!
      • threat
        • 2.Bb5#
      • 1...Rxd7+
        • 2.Bb7#
      • 1...Kxe6
        • 2.Qg6#
      • 1...Rxe6
        • 2.d8Q#
      • 1...Sxa4
        • 2.Bxa4#
      • 1...Bg1
        • 2.Qe5#
      • 1...Be5
        • 2.Qxe5#
      • 1...Sd4
        • 2.Qd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(d);SBLOCK::R(C)+B(D)
    • R(h);CHECK,SBLOCK,XP(H)::R(C)+B(D)
    • R(h);N_PINP(H)::PXR(h)=S
    • B(b);N_GUARD,P_PINR(C)::QAB1(F)
    • B(b);N_GUARD::QAB1(F),XB(b)
  • Tries
    • Try
      • Q(F);CHECK
      • Vars
        • K(g);P-FLIGHT,XS(E)::S(A)
      • Refutation
        • B(b);XQ(F)
  • Actual
    • Q(F);
    • Threat
      • R(C)+B(D)
    • Vars
      • R(h);CHECK,SBLOCK,XP(H)::R(C)+B(D)
      • K(g);OGATEB,P-FLIGHT,XS(E)::QAR2(F)
      • R(h);N_PINP(H),SBLOCK,XS(E)::P=Q
      • S(a);OGATE,XP(B)::R(C)+B(D),XS(a)
      • B(b);N_GUARD,P_PINR(C)::QAB1(F)
      • B(b);N_GUARD::QAB1(F),XB(b)
      • S(c);S_CUTR(d)::QAR1(F)
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