MESON Chess Problem Database

Problem Display
PID: 244479 (8/KPQp4/1p2b3/k6r/1Rnp4/B3n3/1Np5/8 w - - 0 1)

Eerkes, Allard Pieter

Schakend Nederland, 1985

8/KPQp4/1p2b3/k6r/1Rnp4/B3n3/1Np5/8

#2

6 + 9

15148 Sadier Collection 2021

SOLUTION

  • SOUND
  • Sets
    • 1...Rb5
      • 2.Ra4#
    • 1...Sd5
      • 2.Sxc4#
    • 1...Sxb2
      • 2.Qxb6#
    • 1...Sd2
      • 2.Qxb6#
    • 1...Sxa3
      • 2.Qxb6#
    • 1...Se5
      • 2.Qxb6#
    • 1...Sd6
      • 2.Qxb6#
  • Tries
    • 1.Sxc4+?
      • 1...Bxc4
        • 2.Qxb6#
      • 1...Sxc4!
    • 1.Rxc4?
      • threat
        • 2.Qxb6#
      • 1...Kb5
        • 2.Qxb6#
      • 1...Rb5
        • 2.Ra4#
      • 1...Sd5
        • 2.Rc5#
      • 1...Sxc4!
    • 1.Qc6?
      • threat
        • 2.Ra4#
        • 2.Qa4#
      • 1...Sxb2
        • 2.Qxb6#
      • 1...Rb5
        • 2.Ra4#
        • 2.Rxb5#
        • 2.Qxb5#
      • 1...b5
        • 2.Qa6#
      • 1...dxc6!
  • Keys
    • 1.Rxb6!
      • threat
        • 2.Bb4#
      • 1...Sxb2
        • 2.Rb4#
      • 1...Sxa3
        • 2.Rb3#
      • 1...Sxb6
        • 2.Qxb6#
      • 1...Rb5
        • 2.Ra6#
      • 1...Sd5
        • 2.Qc5#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 4
    • ADDED MATES = 1
    • REMOVED MATES = 3
  • Sets
    • R(f);SBLOCK::R1(C)
    • S(b);N_GUARD,S_CUTB(h)::S(A),XS(c)
    • S(c);N_GUARD,XS(A)::QAB1(F),XP(g)
    • S(c);N_GUARD::QAB1(F),XP(g)
    • S(c);N_GUARD,XB(B)::QAB1(F),XP(g)
  • Tries
    • Try
      • S(A);CHECK,XS(c)
      • Vars
        • B(h);XS(A)::QAB1(F),XP(g)
      • Refutation
        • S(b);XS(A)
    • Try
      • R(C);XS(c)
      • Threat
        • QAB1(F),XP(g)
      • Vars
        • K(e);N_SPINP(g),P-FLIGHT::QAR1(F),XP(g)
        • R(f);SBLOCK::R1(C)
        • S(b);S_CUTR(f)::R(C)
      • Refutation
        • S(b);XR(C)
    • Try
      • Q(F);N_PINP(g)
      • Threat
        • DUALS(2)
      • Vars
        • S(c);N_GUARD,XS(A)::QAB1(F),XP(g)
        • P(g);OGATE::QAR1(F)
      • Refutation
        • P(i);XQ(F)
  • Actual
    • R(C);XP(g)
    • Threat
      • B(B)
    • Vars
      • S(c);N_GUARD,XS(A)::QAB(F)+R(C)
      • S(c);N_GUARD,XB(B)::QAB(F)+R(C)
      • S(c);OGATE,P_SPINS(c),XR(C)::QAB1(F),XS(c)
      • R(f);SBLOCK::QAB(F)+R(C),DCHECK
      • S(b);S_CUTR(f)::QAR2(F)
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