MESON Chess Problem Database

Problem Display
PID: 176498 (1R2Q3/r7/1N6/kP6/2P5/3N4/3b1B2/1K6 w - - 0 1)

Stadelmeier, Gerhard

Schach-Echo, 1984

1R2Q3/r7/1N6/kP6/2P5/3N4/3b1B2/1K6

#2

8 + 3

6490 yacpdb 2018

SOLUTION

  • SOUND
  • Sets
    • 1...Ra8
      • 2.Rxa8#
    • 1...Be1
      • 2.Bxe1#
      • 2.Qxe1#
  • Tries
    • 1.Be1?
      • threat
        • 2.Bxd2#
      • 1...Bxe1
        • 2.Qxe1#
      • 1...Bc3
        • 2.Bxc3#
      • 1...Bb4
        • 2.Bxb4#
      • 1...Rb7!
    • 1.Ra8?
      • threat
        • 2.Rxa7#
      • 1...Rxa8
        • 2.Qxa8#
      • 1...Ra6
        • 2.Rxa6#
      • 1...Be3!
    • 1.Qe5?
      • threat
        • 2.Qa1#
      • 1...Bc1
        • 2.Qc3#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bb4!
    • 1.Qe7?
      • threat
        • 2.Qa3#
        • 2.Qxa7#
      • 1...Ra6
        • 2.Qa3#
      • 1...Rb7
        • 2.Qa3#
      • 1...Rc7
        • 2.Qa3#
      • 1...Rd7
        • 2.Qa3#
      • 1...Ra8
        • 2.Rxa8#
        • 2.Qa3#
      • 1...Bc1
        • 2.Qb4#
        • 2.Qxa7#
      • 1...Bb4
        • 2.Qxb4#
        • 2.Qxa7#
      • 1...Rxe7!
    • 1.Qf8?
      • threat
        • 2.Qa3#
      • 1...Bc1
        • 2.Qb4#
      • 1...Bb4
        • 2.Qxb4#
      • 1...Re7!
  • Keys
    • 1.Qe1!
      • threat
        • 2.Qxd2#
      • 1...Bxe1
        • 2.Bxe1#
      • 1...Bc3
        • 2.Qxc3#
      • 1...Bb4
        • 2.Qxb4#

FEATURES

  • Static
    • TYPE = THREAT
    • CHANGED MATES = 0
    • ADDED MATES = 3
    • REMOVED MATES = 1
  • Sets
    • R(c);OGATEB::R(G),XR(c)
  • Tries
    • Try
      • B(B);P_PINB(a)
      • Threat
        • B(B),XB(a)
      • Vars
        • B(a);N_SPINB(a),OGATE,XB(B)::QAB(H),XB(a)
        • B(a);OGATE::B(B),XB(a)
      • Refutation
        • R(c);
    • Try
      • R(G);P_PINR(c)
      • Threat
        • R(G),XR(c)
      • Vars
        • R(c);N_SPINR(c),OGATE,XR(G)::QAR(H),XR(c)
        • R(c);OGATE::R1(G),XR(c)
      • Refutation
        • B(a);
    • Try
      • Q(H);
      • Threat
        • QAR(H)
      • Vars
        • B(a);N_GUARD::QAB(H)
        • B(a);N_GUARD::QAB(H),XB(a)
      • Refutation
        • B(a);
    • Try
      • Q(H);
      • Threat
        • DUALS(2)
      • Vars
        • R(c);::QAR2(H)
      • Refutation
        • R(c);XQ(H)
    • Try
      • Q(H);
      • Threat
        • QAR2(H)
      • Vars
        • B(a);N_GUARD::QAB1(H)
        • B(a);N_GUARD::QAB1(H),XB(a)
      • Refutation
        • R(c);
  • Actual
    • Q(H);P_PINB(a)
    • Threat
      • QAB(H),XB(a)
    • Vars
      • B(a);N_SPINB(a),OGATE,XQ(H)::B(B),XB(a)
      • B(a);OGATE::QAB(H),XB(a)
      • B(a);OGATE::QAB1(H),XB(a)
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