MESON Chess Problem Database

Problem Display
PID: 233884 (b3n2K/r3R1p1/N2pB2p/1p5q/1n2kBp1/1r6/2pQ4/5R2 w - - 0 1)

Ellerman, Arnoldo

Skakbladet, 1951

b3n2K/r3R1p1/N2pB2p/1p5q/1n2kBp1/1r6/2pQ4/5R2

#2

7 + 13

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Qh1
      • 2.Bd7#
    • 1...Qh2
      • 2.Bd7#
    • 1...Qh3
      • 2.Bd7#
    • 1...Qf5
      • 2.Bd5#
    • 1...Rb1
      • 2.Qe3#
    • 1...Rb2
      • 2.Qe3#
    • 1...Re3
      • 2.Qxe3#
    • 1...Sd3
      • 2.Qe3#
    • 1...d5
      • 2.Sc5#
    • 1...g5
      • 2.Bd7#
  • Tries
    • 1.Re1+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Kf3!
    • 1.Qe1+?
      • 1...Kd3
        • 2.Qe3#
      • 1...Re3
        • 2.Qxe3#
      • 1...Kd4!
    • 1.Qe2+?
      • 1...Re3
        • 2.Qxe3#
      • 1...Kd4!
  • Keys
    • 1.Be5!
      • threat
        • 2.Qd4#
      • 1...Kxe5
        • 2.Bd7#
        • 2.Qf4#
      • 1...Qxe5
        • 2.Bf5#
      • 1...dxe5
        • 2.Sc5#
      • 1...Rd3
        • 2.Qf4#
      • 1...Sd3
        • 2.Qe2#
      • 1...Sc6
        • 2.Bd5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 4
    • REMOVED MATES = 9
  • Sets
    • Q(g);N_GUARD::R(F)+B(E)
    • Q(g);SBLOCK::R(F)+B(E),DCHECK
    • R(b);N_GUARD::QAR1(B)
    • R(b);N_GUARD::QAR1(B),XR(b)
    • S(c);S_CUTR(b)::QAR1(B)
    • P(h);N_GUARD,S_CUTQ(g)::S(D)
    • P(k);S_CUTQ(g)::R(F)+B(E)
  • Tries
    • Try
      • R(A);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(B),XR(b)
      • Refutation
        • K(d);S_FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • K(d);S_FLIGHT::QAR1(B)
        • R(b);N_GUARD,P_SPINR(b)::QAR1(B),XR(b)
      • Refutation
        • K(d);P-FLIGHT
    • Try
      • Q(B);CHECK
      • Vars
        • R(b);N_GUARD,P_SPINR(b)::QAR1(B),XR(b)
      • Refutation
        • K(d);P-FLIGHT
  • Actual
    • B(C);
    • Threat
      • QAR1(B)
    • Vars
      • Q(g);N_GUARD,XB(C)::B(E)
      • P(h);N_GUARD,SBLOCK,XB(C)::S(D)
      • R(b);SBLOCK::QAR1(B)
      • S(c);S_CUTR(b)::QAR2(B)
      • S(c);N_GUARD,S_CUTB(l)::B(E)
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