MESON Chess Problem Database

Problem Display
PID: 233843 (5Q1n/2pr1br1/2p1B3/1p2b2N/3R4/2P2k2/K3R3/2N5 w - - 0 1)

Ellerman, Arnoldo

Skakbladet, 1931

5Q1n/2pr1br1/2p1B3/1p2b2N/3R4/2P2k2/K3R3/2N5

#2

8 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Re7
      • 2.Rd3#
    • 1...Bf4
      • 2.Rxf4#
    • 1...Bd6
      • 2.Rd3#
    • 1...Bf6
      • 2.Rf4#
  • Tries
    • 1.Qxf7+?
      • 1...Rdxf7
        • 2.Rd3#
      • 1...Rgxf7
        • 2.Bg4#
      • 1...Bf4
        • 2.Rxf4#
        • 2.Qxf4#
      • 1...Bf6
        • 2.Rf4#
        • 2.Qxf6#
      • 1...Sxf7!
  • Keys
    • 1.Qa3!
      • threat
        • 2.c4#
      • 1...Rxd4
        • 2.cxd4#
      • 1...Bxd4
        • 2.cxd4#
      • 1...Bf4
        • 2.Rxf4#
      • 1...Bd6
        • 2.Rd3#
      • 1...Bg6
        • 2.Bg4#
      • 1...b4
        • 2.cxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 2
  • Sets
    • R(f);N_GUARD::R(E)
    • B(c);N_GUARD,N_SPINB(g)::R1(E),XB(c)
    • B(c);S_CUTR(f)::R(E)
    • B(c);N_GUARD,N_SPINB(g)::R1(E)
  • Tries
    • Try
      • Q(H);CHECK,N_SPINB(G),XB(g)
      • Vars
        • R(f);XQ(H)::R(E)
        • R(h);XQ(H)::B(G)
      • Refutation
        • S(i);XQ(H)
  • Actual
    • Q(H);N_PINB(g)
    • Threat
      • QAR(H)+P(D)
    • Vars
      • R(f);OGATE,XR(E)::QAR(H)+P(D),XR(f)
      • B(c);OGATE,XR(E)::QAR(H)+P(D),XB(c)
      • B(c);N_GUARD::R1(E),XB(c)
      • B(c);S_CUTR(f)::R(E)
      • B(g);N_PINB(G)::B(G)
      • P(b);OGATE::QAR(H)+P(D),XP(b)
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