MESON Chess Problem Database

Problem Display
PID: 166836 (3nb1N1/3p2p1/KB1k4/N3R3/2P3B1/3q3r/3RP3/Q1nr2b1 w - - 0 1)

Ellerman, Arnoldo

Queensland Chess Association, 1919

3nb1N1/3p2p1/KB1k4/N3R3/2P3B1/3q3r/3RP3/Q1nr2b1

#2

10 + 10

15148 Sadier Collection 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Qd5
      • 2.Rexd5#
    • 1...Bd4
      • 2.Rd5#
    • 1...Sc6
      • 2.Sb7#
  • Tries
    • 1.Sb7+?
      • 1...Kc6
        • 2.Se7#
        • 2.Qa4#
      • 1...Sxb7!
    • 1.Qd4+?
      • 1...Bxd4
        • 2.Rd5#
      • 1...Qxd4!
    • 1.Qa3+?
      • 1...Bc5
        • 2.Qxc5#
      • 1...Kxe5!
  • Keys
    • 1.Rg5!
      • threat
        • 2.Qe5#
      • 1...Qd4
        • 2.c5#
      • 1...Re3
        • 2.Qa3#
      • 1...Bh2
        • 2.Qa3#
      • 1...Bd4
        • 2.Rd5#
      • 1...Sc6
        • 2.Sb7#
      • 1...Sf7
        • 2.Rg6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • Q(d);N_GUARD,N_PINP(D)::R1(G),XQ(d)
    • B(c);N_SPINQ(d),S_CUTQ(d)::R1(G)
    • S(i);N_GUARD,SBLOCK::S(F)
  • Tries
    • Try
      • S(F);CHECK
      • Refutation
        • S(i);XS(F)
    • Try
      • Q(A);CHECK,N_PINQ(d)
      • Vars
        • B(c);XQ(A)::R1(G)
      • Refutation
        • Q(d);N_PINP(D),P_SPINQ(d),XQ(A)
    • Try
      • Q(A);CHECK
      • Vars
        • B(c);N_GUARD,P_SPINB(c)::QAB1(A),XB(c)
      • Refutation
        • K(f);N_SPINQ(d),S_FLIGHT,XR(G)
  • Actual
    • R(G);
    • Threat
      • QAB1(A)
    • Vars
      • Q(d);N_PINP(D)::P(D)
      • R(e);S_CUTB(c)::QAB(A)
      • B(c);N_GUARD::QAB(A)
      • B(c);N_SPINQ(d),S_CUTQ(d)::R1(G)
      • S(i);N_GUARD,SBLOCK::S(F)
      • S(i);N_GUARD,S_CUTB(j)::R(G)
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