MESON Chess Problem Database

Problem Display
PID: 83505 (2R5/8/8/4K3/1p1N2p1/3kPN2/B2b4/3r2Q1 w - - 0 1)

Ellerman, Arnoldo

Good Companions, 1918

2R5/8/8/4K3/1p1N2p1/3kPN2/B2b4/3r2Q1

#2

7 + 5

6490 yacpdb 2009

SOLUTION

  • SOUND
  • Sets
    • 1...Rb1
      • 2.Bxb1#
    • 1...Bc1
      • 2.Bb1#
    • 1...Bc3
      • 2.Bc4#
  • Tries
    • 1.Qf2?
      • threat
        • 2.Qe2#
      • 1...Re1
        • 2.Qxd2#
      • 1...gxf3!
    • 1.Qh2?
      • threat
        • 2.Qe2#
      • 1...Kxe3
        • 2.Qe2#
      • 1...Re1
        • 2.Qxd2#
      • 1...gxf3!
    • 1.Qxd1?
      • threat
        • 2.Qe2#
        • 2.Qxd2#
      • 1...Kxe3
        • 2.Qe2#
        • 2.Qxd2#
      • 1...gxf3!
    • 1.Qf1+?
      • 1...Kxe3
        • 2.Sc2#
        • 2.Sf5#
        • 2.Qe2#
      • 1...Rxf1!
    • 1.Qg2?
      • threat
        • 2.Qe2#
      • 1...Kxe3
        • 2.Qe2#
      • 1...Re1
        • 2.Qxd2#
      • 1...gxf3!
  • Keys
    • 1.Kf4!
      • threat
        • 2.Se5#
      • 1...Bxe3+
        • 2.Qxe3#
      • 1...gxf3
        • 2.Qg6#
      • 1...Rf1
        • 2.Qxf1#
      • 1...Bc1
        • 2.Bb1#
      • 1...Be1
        • 2.Qf1#
      • 1...Bc3
        • 2.Bc4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • R(a);N_GUARD::B(B),XR(a)
    • B(b);S_CUTR(a)::B(B)
    • B(b);P_PINS(E),SBLOCK::B(B)
  • Tries
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • R(a);N_GUARD,P_PINP(C)::QAR1(A),XB(b)
      • Refutation
        • P(e);XS(D)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P-FLIGHT,XP(C)::QAR1(A)
        • R(a);N_GUARD,P_PINP(C)::QAR1(A),XB(b)
      • Refutation
        • P(e);XS(D)
    • Try
      • Q(A);P_PINB(b),XR(a)
      • Threat
        • DUALS(2)
      • Refutation
        • P(e);XS(D)
    • Try
      • Q(A);CHECK
      • Refutation
        • R(a);XQ(A)
    • Try
      • Q(A);
      • Threat
        • QAB1(A)
      • Vars
        • K(c);P-FLIGHT,XP(C)::QAR1(A)
        • R(a);N_GUARD,P_PINP(C)::QAR1(A),XB(b)
      • Refutation
        • P(e);XS(D)
  • Actual
    • K(F);P_SPINP(C),S_FLIGHT
    • Threat
      • S(D)
    • Vars
      • B(b);CHECK,OGATE,XP(C)::QAR1(A),XB(b)
      • P(e);OGATE,XS(D)::QAB(A)
      • R(a);N_GUARD,P_PINS(D)::QAB(A),XR(a)
      • B(b);S_CUTR(a)::B(B)
      • B(b);N_PINP(C),S_CUTR(a)::QAB(A)
      • B(b);N_PINP(C),SBLOCK::B(B)
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