MESON Chess Problem Database

Problem Display
PID: 87508 (1n1Q2K1/2R1B3/b1p1k1p1/1n4R1/2p2P2/2b5/3Prpp1/3B1q2 w - - 0 1)

Eerkes, Allard Pieter

American Chess Problemist, 1950

1n1Q2K1/2R1B3/b1p1k1p1/1n4R1/2p2P2/2b5/3Prpp1/3B1q2

#2

8 + 12

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Re1
      • 2.Bg4#
    • 1...Rxd2
      • 2.Bg4#
    • 1...Re3
      • 2.Bg4#
    • 1...Re4
      • 2.Bg4#
    • 1...Sa3
      • 2.Qd6#
    • 1...Sd4
      • 2.Qd6#
    • 1...Sd6
      • 2.Qxd6#
    • 1...Sa7
      • 2.Qd6#
    • 1...Sxc7
      • 2.Qd6#
    • 1...Sd7
      • 2.Qxd7#
    • 1...c5
      • 2.Qd5#
  • Tries
    • 1.Rxg6+?
      • 1...Bf6
        • 2.Rxf6#
      • 1...Kf5!
    • 1.Rxc6+?
      • 1...Sd6
        • 2.Rxd6#
        • 2.Qxd6#
      • 1...Sxc6!
    • 1.Qc8+?
      • 1...Sd7
        • 2.Qxd7#
      • 1...Bxc8!
  • Keys
    • 1.Qd3!
      • threat
        • 2.Qxc4#
        • 2.Qh3#
      • 1...Rxd2
        • 2.Bg4#
        • 2.Qh3#
      • 1...Sxc7
        • 2.Qd6#
      • 1...cxd3
        • 2.Bb3#
      • 1...Sd7
        • 2.Qxd7#
      • 1...g1Q
        • 2.Qxc4#
      • 1...g1S
        • 2.Qxc4#
      • 1...g1B
        • 2.Qxc4#
      • 1...g1R
        • 2.Qxc4#
      • 1...Re5
        • 2.Rxg6#
      • 1...Qh1
        • 2.Qxc4#
      • 1...Re1
        • 2.Bg4#
        • 2.Qh3#
      • 1...Re3
        • 2.Bg4#
      • 1...Re4
        • 2.Bg4#
        • 2.Qh3#
      • 1...Be5
        • 2.Qxc4#
      • 1...Sa3
        • 2.Qh3#
        • 2.Qd6#
      • 1...Sd4
        • 2.Qxg6#
      • 1...Sd6
        • 2.Qxd6#
      • 1...Sa7
        • 2.Qh3#
        • 2.Qd6#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 1
    • ADDED MATES = 8
    • REMOVED MATES = 6
  • Sets
    • R(b);OGATE::B(A)
    • R(b);OGATE,XP(B)::B(A)
    • S(g);N_GUARD::QAR1(G)
    • S(g);N_GUARD::QAR1(G),XS(g)
    • S(g);N_GUARD,XR(E)::QAR1(G)
    • S(l);N_GUARD::QAB1(G),XS(l)
    • P(i);N_GUARD::QAB1(G)
  • Tries
    • Try
      • R(D);CHECK,XP(k)
      • Vars
        • B(e);N_GUARD,P_SPINB(e)::R1(D),XB(e)
      • Refutation
        • K(j);S_FLIGHT
    • Try
      • R(E);CHECK,XP(i)
      • Refutation
        • S(l);XR(E)
    • Try
      • Q(G);CHECK
      • Vars
        • S(l);N_GUARD,P_SPINS(l)::QAB1(G),XS(l)
      • Refutation
        • B(h);XQ(G)
  • Actual
    • Q(G);
    • Threat
      • DUALS(2)
    • Vars
      • S(g);N_GUARD,XR(E)::QAR1(G)
      • P(f);OGATEB,XQ(G)::B(A)
      • S(l);N_GUARD::QAB1(G),XS(l)
      • P(d);::QAB(G),XP(f)
      • R(b);S_CUTB(e)::R(D),XP(k)
      • Q(a);::QAB(G),XP(f)
      • R(b);OGATE::B(A)
      • B(e);::QAB(G),XP(f)
      • S(g);S_CUTB(e)::QAR2(G),XP(k)
      • S(g);N_GUARD::QAR1(G),XS(g)
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